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Why did the Huai River basin and other rivers in China become so heavily polluted?
Responses

A. Laws and regulations in China were extremely strict and expensive.

B. The Chinese government encouraged industrialization to keep up with a growing population.

C. The rivers run through unpopulated areas so would not affect people's health.

D. China had so many rivers that people thought polluting a few would have little impact.

Answer:

iAiA and iBiB

Explanation:

Blood type in humans is controlled by a gene with three alleles namely: iA, iB, and i. Alleles iA and iB are dominant over allele 'i' but codominant. The following are the allelic combinations of the genotype and the resulting blood types:

iAiA or iAi - type A

iBiB or iBi - type B

iAiB - type AB

ii - type O

According to this question, one parent has type A blood and the other has type B. If all the offsprings of these parents have blood type AB, this means that the parents must have a genotype of iAiA and iBiB respectively.

Answer:

Cell division is the process of dividing the cells

The statement that does not properly describe the regulation and utilization of blood glucose under normal conditions is:

c. the pancreas secretes glucagon in response to elevated levels of blood glucose to promote the breakdown of glycogen storage.

Explanation:

Under normal conditions, the regulation and utilization of blood glucose involves a complex interplay of hormones and metabolic processes. The liver plays a key role in this process by storing glucose as glycogen and releasing it into the bloodstream when needed.

Insulin is the primary hormone involved in the uptake and utilization of glucose by cells. It promotes the transport of glucose from the bloodstream into cells, where it can be used for energy or stored as glycogen.

Conversely, glucagon is secreted by the pancreas in response to low levels of blood glucose, not high levels. It stimulates the breakdown of glycogen in the liver, which releases glucose into the bloodstream to raise blood glucose levels.

Therefore, statement c. is incorrect, as glucagon is secreted in response to low levels of blood glucose, not high levels.

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Answer:

sex

Explanation:

Sex refers to the biological differences males and females. Two distinct sexes- males and females are determined by sex chromosomes and genes that form certain gonads, internal and external genitalia, and physiological hormones.

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The biological differences between men and women and their roles in reproduction refers to a  that explains the variations in human sexual characteristics, which include the biological differences between male and female reproductive systems and their respective functions.

The primary roles of these differences lie in their roles in the reproductive process. Here are some additional details:Men have testicles that produce and secrete testosterone, which promotes the growth of muscles and other male characteristics such as facial hair and deeper voices. In contrast, women have ovaries that produce eggs, estrogen, and progesterone, which regulate the menstrual cycle and pregnancy. Women also have a uterus, which is a muscular organ that houses and nourishes a fertilized egg to form a baby during pregnancy.

During sexual reproduction, sperm from the male's reproductive system unite with an egg from the female's reproductive system to form a fertilized egg that implants in the uterus. Hormones and other biological factors influence each partner's ability to reproduce. Women are the only gender that can carry a pregnancy to term, and men are responsible for fertilizing the egg during sexual intercourse. Therefore, biological differences in human reproductive systems are critical in maintaining the continuation of the human species, and understanding these differences is essential for managing human reproductive health and fertility.

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Answer:  Please see explanation column

Explanation:

Sample provided to Brad = a piece of bread and egg yolk

1. We know that Bread is a carbohydrate containing starch  

To investigate the presence of starch/ Carbohydrate  in Bread

Materials: Bunsen burner,test tubes, food product -Bread,iodine solution

Method

1. Place a sample of bread  into the test tube.  

2. Place a few drops of iodine solution on the bread

3. Take  observations.

4. Wait a few more minutes and note any other changes.

Observations

On addition of iodine to the bread , if we notice a blue-black  coloration,  we will conclude that the right component found in bread is starch /carbohydrate

The above procedure can also be confirmed using

-Molisch’s reagent–which gives us a purple or violet color ring on addition to the bread

- Fehling’s reagent  –which gives a Red precipitate to indicate  the presence of  in the bread

-Benedict’s reagent  –which gives  Red precipitate to indicate  the presence of carbohydrates in the bread.

-Tollen’s reagent – which gives us Silver mirror to  confirm the presence of carbohydrate in the bread.

2. We know that egg yolk contains protein,

To investigate the presence of Protein  in egg yolk using biuret test

Materials: Bunsen burner,test tube, food product -egg yolk ,   Aqueous copper sulfate solution

Method

1. Place a sample of egg yolk   into the test tube.  

2. Place a few drops of  Aqueous copper sulfate solution  on the sample of egg yolk

3. Note observations.

4. Wait a while and  note any other changes.

Observations

On addition of Aqueous copper sulfate to the egg yolk  , if we notice a violet coloration,we will conclude that the right component found in egg yolk is protein

The above procedure can also be confirmed using

Xanthoproteic test – which on addition of  Nitric acid to the egg yolk gives a Yellow coloration

Millions test – which on addition of  Mercuric sulfate in the presence of sodium nitrite and sulfuric acid to the sample of egg yolk gives  Brick red color solution confirms the presence of proteins.

Ninhydrin test – which on addition of  Pyridine solution of ninhydrin to the sample of egg yolk gives  Violet color solution confirms the presence of proteins.

Biodiversity decreases because plants and animals adapted for fresh water will not survive and reproduce in a different environment.

The term sea rise has to do with a situation in which there is a sudden increase in the sea level. This could lead to a sudden overflow of water into rivers lakes and ponds.

We know that sea water is salty, there is excess salt concentration in a sea water while fresh water does not contain salt at all. In these cases whereby there is an overflow of seawater, the water carries salt along with it. This implies that land and fresh water could become contaminated with this salt and that would have catastrophic effects on these ecosystems.

Since fresh water organisms can not tolerate a sudden increase in the concentration of salt in the ecosystem, biodiversity decreases because plants and animals adapted for fresh water will not survive and reproduce in a different environment.

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MISSING PARTS

When sea levels rise as rapidly as they have been, even a small increase can have devastating effects on coastal habitats farther inland. It can cause destructive erosion, wetland flooding, aquifer and agricultural soil contamination with salt, and lost habitat for fish, birds, and plants. What happens to biodiversity in coastal communities as the sea level rises?

A

Biodiversity increases due to the merging of salt water and fresh water ecosystems.

B

Biodiversity decreases because plants and animals adapted for fresh water will not survive and reproduce in a different environment.

C

Biodiversity decreases because there are fewer salt water species than there are fresh water species.

D

Biodiversity increases due to the survival of both fresh water and salt water species.

The events that caused the oceans to form are as the earth cooled, water condensed and the sun released a strong burst of water vapor.

Oceans are formed millions of years ago when the water drained into the great hollows on the Earth's surface, the primeval ocean came into existence.

These two events are responsible for the formation of the oceans which is the primitive habitat of the aquatic ecosystem.

Therefore, the events that caused the oceans to form are as the earth cooled, water condensed and the sun released a strong burst of water vapor.

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CFTR receptor moves chloride ions out of a cell by active transport is an example of  a reaction requiring the input of ATP.

In general , the  CFTR protein is a specific  protein called an ion channel. These ion channel also moves an atoms or molecules that provide an electrical signal that comes from inside the cell to outside, or vice versa. Inside the lungs , the CFTR ion channel helps to move chloride ions from inside the cell to outside the cell.

Hence, cystic fibrosis transmembrane conductance regulator (CFTR) are the specific channel/enzyme which helps in the passive diffusion of chloride and bicarbonate mediated by epithelial cell membranes.

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A model that uses DNA comparisons to see how long two different organisms have been evolving independently from each other is referred to as molecular clock. It makes use of a genetic material that go through mutation. This is used to calculate the time of evolution between two different organisms.

A phylogenetic tree is also called as evolutionary tree. It is a diagram used to illustrate the lines of evolutionary descent of various species from a common ancestor. A cladogram is is a diagram that illustrate the relationships of various froups of taxa.

Answer - A. molecular clock hypothesis

Answer:

When the nerves of these muscles become weak (paretic) or paralyzed, the muscles relax, and the cartilages tend to collapse inwards resulting in laryngeal paralysis.The intrinsic muscles of the larynx function to move the vocal cartilages and control tension. They are innervated by the vagus nerve

Explanation:

adding a chlorine base product such as sodium hypoglyphosium or household bleach to water to kill bacteria and viruses

Answer:

h a i

Explanation:

Answer:

The correct answer is stem cells

Yes, iodine, chlorine, and bromine are examples of elements that are the basis for many effective antimicrobial agents.

These elements have antimicrobial properties that make them useful in the disinfection and sterilization of various surfaces and materials.

Iodine is a halogen element that has long been used as an antiseptic and disinfectant. It is effective against a broad spectrum of microorganisms, including bacteria, viruses, and fungi.

Iodine can be used in various forms, including as an iodine tincture, iodine tablets, or iodophors, which are iodine-containing complexes that release iodine slowly.

Chlorine is another halogen element that is commonly used as a disinfectant. It is effective against a wide range of microorganisms, including bacteria, viruses, and protozoa.

Chlorine can be used in various forms, including sodium hypochlorite, calcium hypochlorite, or chlorine dioxide.

Bromine is also a halogen element that has antimicrobial properties. It is used as a disinfectant in swimming pools and hot tubs, where it can effectively kill bacteria and other microorganisms.

Overall, these elements have been used for their antimicrobial properties for many years and continue to be an important part of infection control in various settings, including hospitals, laboratories, and public health facilities.

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Answer:

B. Human activities and natural events can damage the environment.,

Explanation:

Human activities are those activities carried out by a human being. The environment is being degraded daily as a result of the activities of man as well as natural occurrences e.g earthquake, tsunami, wild fire etc.

Human activities also called anthropogenic activities that damage the environment include sewage pollution, burning of fossil fuels, oil spillage etc. Hence, according to this question, human activities and natural events can damage the environment.

The virus not reaching Louisiana is confirmed by the antibody test of the population if there is no antibody against the virus it is believed that the virus is not spread.

The virus infects the body by invading the host cell and injecting its genetic material and replicating inside the host cell.

Viruses, bacteria, or any substance which is foreign to the host body is act as an antigen for them and develops antibody against this virus to the other substances.

Therefore, by the antibody test, it may be easier to find how any virus spread in a particular area.

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In humans, normal somatic cells contain 23 pairs of chromosomes, for a total of 46 chromosomes. One of these pairs is the sex chromosomes (XX in females, XY in males) and the other 22 pairs are called autosomes. Chromosome 21 is one of these autosomes.

During meiosis, the process of cell division that produces gametes (eggs and sperm), the chromosome number is reduced by half. In females, meiosis produces one mature egg cell and three small, nonfunctional cells called polar bodies.

In the first stage of meiosis, called meiosis I, the homologous pairs of chromosomes (one inherited from the mother and one from the father) come together and exchange genetic material in a process called crossing-over. Then, the homologous pairs separate, so that each resulting cell contains only one member of each pair. In the second stage of meiosis, called meiosis II, the sister chromatids of each chromosome separate, resulting in four haploid cells, each containing one copy of each chromosome.

Therefore, in the secondary oocyte, which is the cell that is ovulated and can potentially be fertilized by a sperm, we would expect there to be one copy of chromosome 21, just like in the other haploid cells produced by meiosis II. However, it is important to note that during fertilization, the secondary oocyte fuses with a sperm cell, and the resulting zygote will have two copies of each chromosome, including two copies of chromosome 21.

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Answer:

There are four main stages in the water cycle. They are evaporation, condensation, precipitation and collection

Explanation:

Evaporation- Is the the process in which water changes from a liquid to a gas or vapor.

Condensation- Is the process in which water vapor or gas in the air is changed into a liquid. Is the opposite of evaporation.

Precipitation- Precipitation is water from clouds in the form of rain, freezing rain, sleet, snow, or hail.

Collection- This is when water that falls from the clouds as rain, snow, hail or sleet, collects in the oceans, rivers, lakes, streams. Also some will soak into the ground and will collect as ground water.

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Answer:

The brain and the spinal cord.

Explanation:

The brain controls everything and it sends messages through the spinal cord.

Answer:

i thinks its all of the above

Explanation:

Answer:

Hair and nails are mostly made of protein. Your body uses protein to build and repair tissues. You also use protein to make enzymes, hormones, and other body chemicals. Protein is an important building block of bones, muscles, cartilage, skin, and blood.

Explanation:

Answer:

Proteins contain amino acids

Explanation:

Amino acids combine to create proteins.

The average number of divisions that a human cell cultured in a dish can undergo is approximately c)40-60.

This range is known as the Hayflick limit, which states that normal human cells have a finite number of divisions before they stop growing and eventually die. This limit helps to prevent cells from becoming cancerous and uncontrolled in growth.

The exact number of divisions can vary depending on various factors such as the type of cell, the conditions in which it is grown, and the presence of certain growth factors or mutations. However, on average, human cells can divide about 50 to 70 times before reaching the Hayflick limit.

It is important to note that this limit does not apply to all cells, such as cancer cells, which have the ability to divide endlessly and evade the Hayflick limit. Understanding the Hayflick limit and its mechanisms has provided important insights into aging, cell biology, and the development of cancer.

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In many instances, you can record natural sounds. Using your video camera to record background noise is the simplest method. Simply place the camera in a decent location to record the scene's ambient noise, being careful to avoid being too near to anything that sounds notably louder than the rest of the background.

You'll need a digital recorder and a microphone to record animals. A self-contained system, like those in cellphones and voice recorders, is one choice. A hydrophone is an underwater instrument that listens for and captures all ocean noises.

Their application in a natural sound recording is constrained, nevertheless, because they do not react linearly to all frequencies. Condenser mics, which provide a higher-quality signal but need a power source, are the preferred choice for most field recordists. Little condensers are electret microphones.

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The “Nutcracker man” was actually a specimen of a species Australopithecus boisei.

Australopithecus boisei is an extinct hominid that lived during the Pleistocene epoch in eastern Africa. It is classified as a gracile (slender) australopithecine of the Early Pleistocene.The hominid species was first discovered in the early 1900s by German scientists. However, Mary and Louis Leakey were instrumental in making this hominid species famous. Mary Leakey uncovered the first specimens at Olduvai Gorge, Tanzania, in 1959. She found a skull, jaws, and teeth that were different from all other australopithecines.

The skull of the "Nutcracker man" was a short, broad, and flat head that had large molars and premolars for grinding tough vegetation. The skeletal structure of this species indicated that it had a powerful jaw, but it had a smaller brain than modern humans. They existed about 2.6 million to 1.2 million years ago.Australopithecus boisei was called the “Nutcracker Man” because it had large, robust teeth that were used to crack hard nuts and seeds. The Nutcracker Man's powerful teeth, combined with his strong jaw muscles, would have allowed him to eat tough, fibrous vegetation.

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requires a lot of oxygen to oxidize

Explanation:

Lipids are made of fats which are complex components and require high amounts of oxygen to break them down

Environmental factors can influence natural selection because they can increase or decrease and what can they increase or decrease in the amount of genetic variation in a population.

Populations of living things adapt and change through a process called natural selection. A population's members are naturally varied, which means that they are all distinctive in some ways. Because of this variety, some people have characteristics that suit their surroundings more than others.

Four requirements must be met for natural selection to take place: reproduction, inheritance, variety in physical traits, and variation in the number of children produced by each person.

Reproduction:

A population must procreate to produce a new generation in order for natural selection to affect it. Over many generations, people who have the characteristics that are most compatible with their environment tend to breed more than people who don't.

Heredity:

Since the genes of the parents combine to form the DNA of their offspring, heredity and reproduction go hand in hand. Natural selection must operate if parents with favourable qualities pass those traits on to their kids.

Variation in Characteristics:

Only when individuals within a community differ in their personal features can natural selection take place. For instance, different people must have varied colors in order to research natural selection on color within a population. There wouldn't be any traits for nature to "select" over others in the absence of variety in traits.

Fitness Variation:

Compared to its popular notion, fitness has a more technical meaning. Fitness in the context of evolution refers to an organism's capacity for maximum survival and reproduction. Natural selection cannot take place in a population unless its individuals have varying levels of fitness. Some people must have characteristics that make it easier for them to survive and procreate more frequently than others. Otherwise, natural selection cannot act to increase the number of people with advantageous features and decrease the number of people with undesirable qualities.

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The similar structure in different species that evolved separately is called a convergent structure.

The term “convergent structure” refers to the process by which distinct species with different ancestors develop similar structures, either through adaptation to similar environmental conditions or similar ecological roles.

This phenomenon, known as convergent evolution, typically results in different organisms developing similar adaptations to solve the same problem.

Both structures have evolved to perform the same task (flight), and both have independently evolved to do so due to selective pressure in a specific habitat.

A similar structure, shared by different species, is termed homology when it is derived from a common ancestor, and analogy when it is not.

The similarity between bat wings and bird wings is a classic example of analogy, since these structures did not evolve from a common ancestral structure but instead emerged independently in response to selective pressure.

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