what are the two significant morphological developments that occurred in hominins and how did they contribute to their success
Answers
The two main physical changes in hominins were the ability to walk on two legs and the evolution of smaller, blunt canines.
Sahelanthropus tchadensis, the oldest known hominid, lived between 6 and 7 million years ago.They had a substantially complete skull, with the foramen magnum—the opening at the base of the skull through which the spinal chord passes—positioned and oriented so that they could stand and walk on two legs, similar to modern humans with a vertical spinal column.
Bipedalism gave them complete arm freedom, allowing them to build and utilize tools more effectively, reach up to pick fruit from trees, and use their hands for social interaction and exhibition. They can easily transport both infants and tools.
These species would have benefited from this hybridization of terrestrial and arboreal behaviour in the mixed woodland habitat they inhabited. Males' canines are smaller and more bluntly shaped than those of modern humans, but they are larger and more pointed than those of male apes. They no longer need large canines like earlier apes since they had begun employing more sophisticated tools.
The canine teeth are extremely crucial for speaking, biting, and many other essential tasks.
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Related Questions
HELP ASAP
6. Which of the following protists possesses pseudopods?
Answers
what prevents coral reefs from surviving below the euphotic zone? group of answer choices high water density high pressure inadequate sunlight saline water damage from storms
Answers
Inadequate sunlight prevents coral reefs from surviving below the euphotic zone.
The majority of coral reefs are found nearby in shallow water. Due of this, they are particularly susceptible to the negative consequences of human activity, both directly via the exploitation of reef resources and indirectly through the effects of nearby human activities on land and in the coastal zone. The social, cultural, and economic fabric of local coastal communities is intricately intertwined with many of the human activities that harm coral reefs.
Numerous local risks to coral reefs exist, such as:
Physical harm or devastation caused by recreational overuse, coastal development, dredging, quarrying, harmful fishing methods and equipment, boat anchors and groundings, etc (touching or removing corals).
Land-based pollution that makes its way into coastal waterways There are several pollution kinds and sources from land-based activities.
1.sedimentation
2. Nutrients
3. pathogen
4. Toxic substances
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Please help me :( the author believes that Charles Goodyear was a dedicated scientist who kept improving on his work. Which sentence best supports this statement
Answers
Answer:
what r the sentences
Explanation:
What is the niche of the shark whales?
Answers
Answer:
The whale sharks niche in the environment is essentially population control. The whale shark spends all day eating and without it the populations of krill and plankton would increase by a large amount.
Explanation:
Whale sharks have a broad distribution in tropical and warm temperate seas, usually between latitudes 30°N and 35°S. They are known to inhabit both deep and shallow coastal waters and the lagoons of coral atolls and reefs. Australia is one of the most reliable locations to find whale sharks. It is very difficult to conduct research on the shark's role in the ecosystem so scientists aren't sure what would happen if sharks became extinct. ... If the whale shark becomes extinct, there might be an increase in plankton. However, plankton are also eaten by several species of whale. Whale sharks are one of the most amazing animals in the world — and while they may be sharks, they're also one of the most gentle fish in the sea. In fact, whale sharks are so gentle, they're completely safe to swim around. Our Whale Shark Encounter tour gives you the opportunity to do just that.
That's one scary shoork-
why might an overactive thyroid make a person skinny?
A.it could make the person feel sleepy and less energetic
B.it could make the person want to do more exercise.
C.it could make the person's body absorb calories more quickly
D.it could help the person eat less fattening foods.
Answers
Answer: i think A
Explanation: the thyroid uses the calories so an overactive thyroid would use those calories more quickly, causing the person to lose energy and feel tired.
Egg of a bird represent an organ
Answers
It is a false statement that the egg of a bird represent an organ.
What is an organ?An organ is composed of many tissues that work together for the same purpose. Tissues in turn are composed of cells.
The egg of a bed is only composed of cells that divide rapidly hence the egg of a bird is not an example of an organ and the statement is false.
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Which of the following statements offers the best explanation of how deforesting Hubbard Brook's watershed 2 (W2) affected the nitrogen cycle?
Denitrification rates increased, resulting in a decrease in the export of ammonium.
Microbial immobilization rates increased, resulting in a decline in stream nitrogen.
Mineralization rates increased, causing the export of ammonium to increase.
Plant uptake of nitrogen stopped, resulting in an increase in the export of nitrate.
Answers
The best explanation of how deforesting Hubbard Brook's watershed 2 (W2) affected the nitrogen cycle is that microbial immobilization rates increased, resulting in a decline in stream nitrogen.
Deforesting a watershed can have significant impacts on the nitrogen cycle within the ecosystem. In the case of Hubbard Brook's watershed 2 (W2), the best explanation is that microbial immobilization rates increased, leading to a decline in stream nitrogen. Microbial immobilization refers to the process in which microorganisms in the soil and water take up nitrogen from the surrounding environment and incorporate it into their biomass. When the watershed was deforested, it likely resulted in an increase in organic matter decomposition and the release of nitrogen into the system. As a response, microorganisms in the soil and water would have increased their activity, taking up more nitrogen and immobilizing it within their cells. The increase in microbial immobilization would lead to a decline in stream nitrogen, as more nitrogen is retained within the microbial biomass and less is available for export to the stream. This can disrupt the balance of nitrogen availability for other organisms in the ecosystem, potentially affecting plant growth and the overall nitrogen cycle.
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5. The diagram below represents an incomplete section of a DNA molecule. The boxes represent unidentified bases.
When the boxes are filled in, the total number of bases represented by the letter A (both inside and outside the boxes) will be
a. 4
b. 2
c. 1
d. 3
Answers
Answer:
Explanation:
There will be a total number of 3 bases that are represented by letter A. Adenine pairs with thymine and there are two thymine bases, which are paired to two adenine bases. There is an additional adenine base on the outside and accounts for the three adenine bases inside and outside.
Pls help due in 5 minutes WILL MARK BRAINLIEST
Answers
iii = time and solution concentration (maybe)
The cell cycle is a predictable sequence of events that makes up the lifetime of all cells.
Sort the events to the phase of the cell cycle during which they occur.
i. The cytoplasm doubles, increasing the overall size and volume of the cell.
ii. Chromosomes are duplicated in preparation for cell division.
iii. The duplicated chromosomes separate and are distributed to two offspring nuclei.
iv. The cell divides into two offspring cells, each with a complete set of chromosomes from the parent cell.
a. Interphase b. Mitosis c. Cytokinesis
Answers
During interphase, the cytoplasm doubles, increasing the overall size and volume of the cell. Moreover, also during interphase, chromosomes are duplicated in preparation for cell division.
What is the cell cycle?The cell cycle is a series of sequential steps in the cell life of a given cell, which includes interphase, mitosis and cytokinesis.
During mitosis, the duplicated chromosomes separate and then they are distributed to two offspring cell nuclei.
During cytokinesis, the cell divides into two offspring (daughter) cells, each with a complete set of chromosomes from the parent cell.
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In a study reported in this module on unsafe work practices, researchers were observed doing this 2.6 times per observation on average while handling human pathogens.
Sneezing in the laboratory
Coughing in the laboratory
Eating or drinking in the laboratory
Touching their eyes, nose, or mouth
Answers
Option D, Touching their eyes, nose, or mouth pathogens can spread.
What is a pathogen?An organism that infects its host with disease is referred to as a pathogen, and the severity of the disease symptoms is referred to as virulence. Pathogens include viruses, bacteria, unicellular and multicellular eukaryotes, as well as other taxonomically diverse organisms.In biology, a pathogen is any organism or agent that has the potential to cause illness. Another name for a pathogen is an infectious agent or just a germ. In the 1880s, the word "pathogen" first became in use.There are five basic categories of pathogenic organisms: bacteria, fungus, viruses, protozoa, and worms.This can involve non-sexual hand-shaking or sexual touch during an intimate deed. Numerous illnesses, such as the cholera bacteria, can be spread via contaminated water.Learn more about pathogen refer to ;
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the probability that individual iii-5 will develop friedreich's ataxia is closest to which of the following?
Answers
Based on the pedigree shown, the probability that an individual III-5 will develop Friedrich's ataxia is closest to 25%.
What is Friedrich's ataxia?Friedreich's ataxia is an inherited genetic disorder that affects the nervous system and is caused by a mutation in the FXN gene. Friedreich's ataxia is an autosomal recessive disorder,
Considering the given pedigree, it can be seen that the probability of individual iii-5 will develop Friedreich's ataxia is 1/4 since only one parent is a carrier.
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Eighty-five to ninety percent of all intervertebral disk herniations occur at what two locations?
Answers
85–90% of all intervertebral disc herniations happen at the disc between L4 and L5 or L5 and S1, making the lower back particularly susceptible.
An issue with one of the rubbery cushions (discs) that lie in the spaces between the vertebrae that make up your spine is referred to as a herniated disc.
A spinal disc has a tougher, rubbery exterior covering a soft, jelly-like interior (nucleus) (annulus). A herniated disc, also known as a slipped disc or a ruptured disc, happens when a portion of the nucleus pushes through a tear in the annulus. Although a herniated disc can develop anywhere along the spine, it most frequently does so in the lower back. A herniated disc may cause pain, numbness, or weakness in an arm or leg, depending on where it is located. Many people with herniated discs don't experience any symptoms.
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(a)
Part A
Which statement best explains what caused some theropods to develop feathers?
A
A mutation in DNA affected the types of proteins produced by placodes.
B
A protein in the placodes caused a mutation in the gene that produces feathers.
C
A mutation in the placode gene caused placodes to produce different DNA.
D
A mutation in DNA caused the placodes that control genes to grow feathers.
Answers
Answer:
d
Explanation:
i have a 90 and get 100s in my biology exams going to 10th grade
Cellulose, the macromolecule found in plant cell walls.
Answers
The statement "Cellulose, the macromolecule found in plant cell walls" is true. the cell walls of plants include the macromolecule cellulose.
It is one of the main components of plant cell walls and provides structural support to plant cells. Cellulose is a complex carbohydrate composed of long chains of glucose molecules linked together.
These chains are arranged in a highly organized and rigid structure, forming strong fibers that contribute to the strength and stability of plant cell walls.
Cellulose is an important component of dietary fiber in humans and plays a role in digestion, although humans lack the necessary enzymes to break down cellulose for energy.
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Complete question :
Cellulose, the macromolecule found in plant cell walls. T/F
What statement is true about vines in the rainforest biome?
A) They grab onto several trees to gain access to sunlight.
B) They keep the structure of the canopy intact.
C) They can grow up to 3,000 ft long.
D) All of the above
PLS HELP ASAP
Answers
Answer:
D
Explanation:
Hope this helps you complete your question :)
How much of farmed aquaculture in the US consists of oysters?
Answers
Answer:
90%
Explanation:
Answer: $186 million or 36 million pounds
Explanation:
https://www.fisheries.noaa.gov/national/aquaculture/us-aquaculture
How does subsistence affect culture?
from anthropology perspect
Answers
Subsistence, referring to the way people obtain their basic needs, has a profound impact on culture. It influences social structures, division of labor, values, beliefs, and daily practices within society.
Explanation:
From an anthropological perspective, subsistence plays a crucial role in shaping culture. Subsistence refers to the means by which people obtain their basic needs, including food, water, shelter, and resources. The way society meets these needs influences various aspects of its culture.
Subsistence strategies, such as foraging, pastoralism, horticulture, agriculture, or industrialization, determine how people organize themselves socially, their division of labor, and their relationship with the natural environment. For example, nomadic hunter-gatherer societies have different social structures and mobility patterns compared to sedentary agricultural societies.
Subsistence practices also impact values, beliefs, and daily practices within a culture. The methods of food production and availability shape culinary traditions, religious rituals, and social norms related to food sharing and distribution. Subsistence strategies influence the development of technology, artistic expressions, and economic systems within society.
Overall, subsistence is deeply intertwined with culture as it shapes the social, economic, and symbolic aspects of society. Understanding a community's subsistence practices provides valuable insights into its cultural patterns, social organization, and worldview.
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plasesssss helppppp meeeee
Answers
Answer:
zy
Explanation:
zy
how do veins differ arteries and capilleries in their structure and function
Answers
Hello,
Vascular smooth muscle (VSM), which is present in ALL arteries regardless of size, has a different role depending on the kind of artery. Similar to a stretched rubber band returning to its original size, a major conduit artery like the aorta has a lot of elastic tissue inside of it, which enables it to expand during systole and then elastically recoil to shrink back to its original diameter during diastole. This function smooths out the difference between systolic and diastolic pressures during each cardiac cycle, preventing systemic blood pressure from experiencing as much variation in pressure as the Because of this, we refer to the major arteies as acting as a pressure reservoir.
The VSM becomes increasingly significant as arteries narrow, and by the time you reach the arterioles, the so-called resistance vessels, you have VSM capable of causing significant changes in artery width. This is what regulates blood pressure and blood flow to certain tissues. Both the autonomic nervous system and regional cues from the tissue being fed play a complicated role in controlling artery VSM.
Capillaries are just a single layer of endothelial cells backed by some basement membrane; they lack a VSM and elastic tissue. Due to their extreme thinness, they serve their primary purpose as exchange vessels, which allows for the quick exchange of nutrients, wastes, and gases (O2, CO2). functioning as a pressure reservoir.
Veins serve as a large volume reservoir for the cardiovascular system because they have less elastic tissue than arteries and are more compliant (they stretch easier). In fact, the venous system contains around 70% of all blood volume at any given time. Veins are therefore referred to as "capacitance vessels" for this reason. Veins also have autonomic-controlled VSM that can contract, sending more blood back to the heart so that more can be put into the arterial system—for example, during emergency situations like major blood loss or during exercise. This volume reservoir can be used as needed. Return of blood to the heart (so-called venous return) is also helped by veins' compliance--as muscles contract, they can easily squeeze the veins, to propel blood back to the heart, and their one-way valves ensure that the flow goes one way.
Thanks,
Eddie
Answer:
Explanation:
Arteries transport blood away from the heart. Veins return blood back toward the heart. Capillaries surround body cells and tissues to deliver and absorb oxygen, nutrients, and other substances. The capillaries also connect the branches of arteries and to the branches of veins.
At what ph level do the gastrin-producing cells stop secreting acid into the stomach?.
Answers
These plants have free-living gametophytes and free-living sporophytes. The sporophyte generation is dominant and larger than the gametophyte generation. There is one type of spore, and the gametophyte generation grows outside of the spore wall. Which plant or plants am I describing? (SELECT ALL THAT APPLY) 000000000 Ferns Cycads Selaginella Lycopodium Conifers Ginkgo Hornworts Mosses Angiosperms 3 pts Liverworts
Answers
The correct answers are: Ferns, Hornworts, Mosses, and Liverworts.
The plants that fit the given description are:
Ferns: Ferns have free-living gametophytes and free-living sporophytes. The sporophyte generation is dominant and larger than the gametophyte generation. Ferns produce one type of spore, and the gametophyte generation grows outside of the spore wall.Horworts: Hornworts also have free-living gametophytes and free-living sporophytes. The sporophyte generation is dominant and larger than the gametophyte generation. Hornworts produce one type of spore, and the gametophyte generation grows outside of the spore wall.Mosses: Mosses have free-living gametophytes and free-living sporophytes. The sporophyte generation is dominant and larger than the gametophyte generation. Mosses produce one type of spore, and the gametophyte generation grows outside of the spore wall.Liverworts: Liverworts also have free-living gametophytes and free-living sporophytes. The sporophyte generation is dominant and larger than the gametophyte generation. Liverworts produce one type of spore, and the gametophyte generation grows outside of the spore wall.Therefore, the correct answers are: Ferns, Hornworts, Mosses, and Liverworts.
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legless lizards have amniotic eggs, but they do not have limbs. based on this diagram, what is the most probable conclusion about the evolution of legless lizards? A. They evolved independently from other reptiles. OB. They branched off from reptiles and followed the amphibian lineage. C. They had ancestors with four limbs, but they lost this trait during evolution. O D. They branched off from reptiles before the four-limb characteristic evolved.
Answers
The most probable conclusion about the evolution of legless lizards is option c - They had ancestors with four limbs, but they lost this trait during evolution.
During the process of evolution, legless lizards have lost their limbs over a long period of time. Their ancestors were originally quadrupedal lizards, but through natural selection and adaptation, the legless form became more advantageous. Legless lizards have a greater ability to burrow underground, which provides them with benefits such as protection and access to prey. As a result, the trait for limblessness became desirable and advantageous in their environment.
Over time, lizards with shorter limbs or no limbs at all were more likely to survive and reproduce, passing on the trait for limblessness to their offspring. This gradual process of natural selection and inheritance led to the evolution of legless lizards as a distinct group with specialized adaptations for their burrowing lifestyle.
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What would happen to the plant population if the caterpillar population decreased?
Answers
Answer:
it was increase
Explanation:
A particularly long radio wave has a wavelength of 1.5 x 10^9 meters. What is the frequency of this radio wave?
Answers
Answer:
0.2Hz
Explanation:
The wavelength of a radiowave can be calculated this;
λ = v/f
Where;
λ = Wavelength (m)
v = speed (m/s)
f = frequency (Hz)
Based on the information provided in this question, λ = 1.5 x 10^9 meters, c = 3 × 10^8m/s, f = ?
Hence, using λ = v/f
f = v/λ
f = 3 × 10^8 ÷ 1.5 x 10^9
f = 2 × 10^(8-9)
f = 2 × 10^-1
f = 0.2Hz
Which of the following best describes a tissue?
Answers
Answer:
The second one.
Explanation:
I don't really know how to explain it, but not 1 or 3, because it's a group of cells and tissues make up organs, and it's not smaller than a cell.
Explain how activation energy is related to exothermic and endothermic reactions.
Answers
Activation energy is related to exothermic and endothermic reactions because in exothermic reaction activation energy is lower than in endothermic reactions.
What is an activation energy?Activation energy is defined as the energy that must be overcome for a chemical reaction to take place.
A chemical reaction can either be exothermic or endothermic reactions.
This activation energy is related to exothermic reaction because there is net energy release from the reaction while in the endothermic reaction there is net absorption to energy.
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Plz someone answer this I need help I asked it 3 times but no one answered
Why do you think it is important to have an international agreed classification?
Answers
Answer:
because it allows scientists to identify, group, and properly name organisms via a standardized system
Explanation:
Critical thinking : Do magnets need to touch a piece of iron or another magnet to exert a magnetic force on the iron or other magnet?
Answers
Answer:
I wouldn't think so because it is the magnetic field that Attracts and repels. When iron is magnetised to something don't the molecules lineup in the North the South pattern or something like that to create a magnetic field and stick together.
I might be wrong because this is my personal opinion on the matter.
Answer:
no because the magnetic force attracts the magnet or the iron to it
Explanation:
Complete the statements below by choosing the correct
part of the neuron from the drop-down menus.
Information enters the neuron through structure
Information passes through structure to reach
structure
Information leaves the neuron through structure
A
B
С
D
E
Answers
Answer:
I believe it's A (dendrite), B (body), and then C (the end of the axon [name is escaping me])
A neuron is a basic nerve cell that builds the nervous system and transmits information throughout the body.
What do you mean by Transmission of information?The transmission of information may be defined as the passing of information from one region of the neuron to another by various means.
Information enters the neuron through the structure known as Dendrites. Information passes through a structure called soma or cell body to reach the structure known as Axon. Information leaves the neuron through the structure called telodendria or terminal boutons.Therefore, all the structures and functions of neurons are described above in a sequential manner.
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