Viruses are often named by​

Answer:

The difference between a stable isotope and an unstable isotope

A "stable isotope" is any of two or more forms of an element whos nuclei contains the same number of protons and electrons, but a different number of neutrons. Stable isotopes remain unchanged indefinitely, but "unstable" (radioactive) isotopes undergo spontaneous disintegration.

Explanation:

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Answer:

hair grows from the root at the bottom of the follicle under your skin . the blood in your scales goes into the follicle and supplies oxygen add nutrients to the hair root which helps your hair grow. as your hair grows it will push through the skin and pass by an oil glands.

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It is preferable to obtain chromosomes to prepare a karyotype during late prophase or metaphase.

During these phases, the chromosomes are fully condensed and visible, making it easier to distinguish between them and identify any abnormalities or variations. During earlier phases of cell division, such as early prophase or anaphase, the chromosomes may not be fully condensed or separated yet. This can make it difficult to accurately count or analyze the chromosomes, leading to errors or incomplete information in the karyotype.

In conclusion, obtaining chromosomes during late prophase or metaphase is the best option for preparing a karyotype due to the fully condensed and visible nature of the chromosomes during these phases.

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Answer:

A

Explanation:

It helps the human body do task like lifting heavy things

Mitochondria helps in ATP (unit of energy) production in cell. Thus, option A is correct.

Muscles are the special type of tissues that have the property of contractibility.

Muscles are attached to a bone, any organ or any other muscle and thus helps in movement and location in an organism.

Muscles are of three types based on their structure and function:

The pigment present in muscles is called myoglobin.

Muscles are rich in mitochondria because they need energy for muscle contraction.

Based on the rate of contraction muscles are of two types:

Thus, muscles are important for movement in an organism.

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Answer:

Cretaceous period

Explanation:

Fossil records suggest that modern birds originated 60 million years ago, after the end of the Cretaceous period about 65 million years ago when dinosaurs died off

Answer:

Recombinant DNA is technology scientists developed that made it possible to insert a human gene into the genetic material of a common bacterium. This “recombinant” micro-organism could now produce the protein encoded by the human gene. Scientists build the human insulin gene in the laboratory. Then they remove a loop of bacterial DNA known as a plasmid and insert the human insulin gene into the plasmid. Researchers return the plasmid to the bacteria and put the “recombinant” bacteria in large fermentation tanks. There, the recombinant bacteria use the gene to begin producing human insulin. Scientists harvest the insulin from the bacteria and purify the substance for use as a medicine for people.

Explanation:

Answer:

A

Explanation:

It is the cell membrane

The plasma membrane is a boundary of cell responsible for the movement of any substance in and out of the cell, hence a is the correct option.

All cells have a cell membrane, also known as a plasma membrane, which divides the inside of the cell from the external environment. The cell membrane controls the flow of substances into and out of the cell.

Watery fluid surrounds and fills cells, this liquid facilitates the movement of substances across the cell membrane as well as within and outside the cell.

Some solutes (solids) can pass through cell membranes depending on their nature.

Therefore cell membrane allows the substance to pass into cell and out of the cell, hence option a is correct.

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The characteristic that distinguishes all chordates from all other animals is the presence of a (c) dorsal, hollow nerve cord.

This nerve cord is located along the back (dorsal) side of the organism and runs longitudinally. It is formed from a folding of the ectoderm during development and gives rise to the central nervous system, including the brain and spinal cord, in vertebrates.

The dorsal, hollow nerve cord serves as a fundamental feature of chordates, playing a vital role in coordinating and transmitting nerve impulses throughout the body. It is unique to chordates and sets them apart from other animal groups.

While other characteristics listed in the options, such as bilateral symmetry, collar cells, a vertebral column, and amniotic egg, may be present in specific groups of chordates or other animals, the dorsal, hollow nerve cord is a defining characteristic that is shared by all chordates.

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No, Carbon dioxide is increasing, as the combustion of fossil fuels for energy has led to an increase in the amount of carbon dioxide in the earth’s atmosphere.

The components of fossil fuels are decaying plants and animals. These fuels may be burned to provide energy and can be found in the crust of the Earth. An example of a fossil fuel is coal, as well as oil and natural gas. Coal is a substance that is typically found in sedimentary rock formations, which are collections of rock, dead plant and animal materials, and layers of silt.

A chunk of coal must contain more than 50% fossilized plant material. Shale is one sedimentary rock type that contains oil in its native form. The thick oil that can be used to make gasoline is created by heating this substance. Typically, pockets of natural gas can be found atop oil deposits.

Gasoline has the chemical formula C8H18. It appears like this when you combine it with oxygen, or when you burn it: 2(C8H18) + 25(O2) = 16(CO2) + 18 (H2O). That’s a significant amount of CO2.

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The correct answer is the letter B. MUTUALISM

Mutualism refers to the symbiotic relationship where both of the organisms involved benefit from each other.

Answer:

The correct answer is : temporal isolation.

Explanation:

Temporal isolation is a one type of prezygotic reproductive isolation in which the the prevention of mating of the two species takes place due to the time difference of breeding, this could be day difference, season difference,  or years difference.

Here in this example the reproductive isolation is taking place due to the difference in their mating time, where L. graminifolia flowers in the early spring and L. canadensis in different season of summer.

Thus, the correct answer is : temporal isolation.

The situation would you see a partial lunar eclipse is a portion of the Moon passes through Earth’s shadow option -c is correct answer.

As the name implies, a partial lunar eclipse happens when the Sun, Earth, and Moon aren't exactly lined up. As a result, only a portion of the Moon enters Earth's umbral shadow and is thus completely covered in red light.

a solar eclipse in which some of the sun's direct rays reach the observer because the moon does not completely block the sun's surface or photosphere. : the entire total solar eclipse that occurs outside of the path of totality.

When the Moon passes between the Sun and Earth, a partial solar eclipse occurs, but the Sun, Moon, and Earth are not exactly lined up. The Sun will appear to be partially obscured, taking on the shape of a crescent.

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Explanation:

no gender traits are not completely a result of societal expectation

Answer:

gender traits are not solely a result of societal expectations. They are influenced by a combination of biological, psychological, and sociocultural factors, with individuals' experiences and self-identity also playing a significant role in how gender is expressed.

Explanation:

Biologically, individuals are assigned a sex at birth based on their physical characteristics, typically categorized as male or female. However, gender goes beyond biological sex and encompasses a range of behaviors, roles, identities, and expressions that are influenced by both nature and nurture.

Psychologically, individuals develop a sense of their own gender identity, which may align with their assigned sex (cisgender) or differ from it (transgender). Gender identity is an internal and deeply-felt sense of being male, female, or another gender, and it is not solely determined by societal expectations.

Societal expectations, cultural norms, and socialization play a significant role in shaping how gender is understood and expressed within a particular culture or society. These expectations can vary across different societies and change over time. Societal factors influence the norms and expectations related to gender roles, behaviors, and appearances, which can impact how individuals express their gender identity.

However, it is important to recognize that individuals have diverse experiences of gender that cannot be solely attributed to societal expectations. Biological factors, such as genetics, hormones, and brain development, also contribute to the development of gender traits. Additionally, personal experiences, self-expression, and individual differences influence how individuals express their gender identity.

Answer:

the answer is astrolabe

Answer:

A. Astrolabe

(I don't have enough words, just ignore this)

Seeds grow with the help of various natural resources like water, oxygen, and sunlight, which help them to sprout and grow roots and develop into new plants. Some seeds grow as soon as they land in the ground, while others need a specific time period to grow.

The life of a plant begins with a seed that contains the necessary resources required for the plant's growth, which includes the embryo, endosperm, and protective seed coat.

The process through which plants grow, reproduce, and die is called their life cycle. It includes different stages like germination, growth, flowering, pollination, fertilization, seed production, and dispersal.

Seeds need water, food, and a little heat to grow into new plants. Water helps seeds to soften and expand, and food helps them to provide the necessary nutrients required for growth. The heat helps seeds to break dormancy and activate enzymes that speed up the germination process.

A new plant has the same life cycle as its parent plant. Plants have a unique life cycle, and every stage of the life cycle is essential for their growth and development. New plants inherit their genetic traits from their parent plants, and their life cycle is the same as that of their parent plant.

New plants that grow from seeds inherit their genetic traits from their parent plants and have the same life cycle as their parent plants. The life cycle of a plant includes the stages of germination, growth, flowering, pollination, fertilization, seed production, and dispersal. Thus, new plants that grow from seeds are like their parent plants.

The correct answer is D. complexity of organisms.

According to evolutionary biologists, organisms must increase in complexity over geological time as a result of natural selection and adaptation to changing environments. This increase in complexity allows organisms to develop new structures and functions that help them survive and reproduce in their respective environments.

As a result, organisms become more specialized and diverse, leading to the emergence of new species and higher levels of biodiversity. While social interactions and the speed of evolutionary processes may change over time, they are not necessarily expected to increase with geological time.

Similarly, the size of organisms may change depending on environmental factors, but it is not a consistent trend over geological time. Therefore, the increase in complexity is considered to be the most significant and consistent trend in the evolution of life on Earth.

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According to evolutionary biologists, organisms must increase in complexity over geological time as a result of natural selection and adaptation to changing environments. The correct answer is D. complexity of organisms.

This increase in complexity allows organisms to develop new structures and functions that help them survive and reproduce in their respective environments. As a result, organisms become more specialized and diverse, leading to the emergence of new species and higher levels of biodiversity. While social interactions and the speed of evolutionary processes may change over time, they are not necessarily expected to increase with geological time.

Similarly, the size of organisms may change depending on environmental factors, but it is not a consistent trend over geological time. Therefore, the increase in complexity is considered to be the most significant and consistent trend in the evolution of life on Earth.

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Nerve cells known as neurons transmit nerve impulses in the form of electrochemical changes.

Neurons are the fundamental units of the nervous system and play a vital role in transmitting and processing information. These specialized cells possess a unique ability to generate and propagate electrical signals, allowing for rapid communication within the nervous system.

Neurons consist of various components, including a cell body, dendrites, and an axon. Dendrites receive incoming signals from other neurons or sensory receptors, while the axon carries the electrical impulses away from the cell body and towards other neurons or target cells.

The transmission of nerve impulses occurs through a process called action potential, wherein a brief electrical charge travels down the axon. At the synapse, the junction between neurons, the electrical signal is converted into a chemical signal, facilitating communication between neurons.

Overall, neurons' capacity to transmit nerve impulses through electrochemical changes enables the intricate network of the nervous system to function, allowing us to perceive, think, move, and respond to the world around us.

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Answer:

They are eliminated from the body as wastes.

Answer:

A is the answer

Explanation:

Answer:

i put a and got it right

Explanation:

Answer:

The correct answer is - DNA --> RNA --> amino acid --> protein --> phenotype.

Explanation:

DNA encodes for the RNA and RNA encodes for the proteins in the process of central dogma to produce protein in two processes called transcription and translation to produce protein.

It begins with encoding DNA into RNA (mRNA), known as transcription, which is moved to the ribosome to translate into amino acid chains with help of tRNA and makes a specific protein which could be a form of genotype which express itself to produce a specific trait that makes a particular phenotype of that trait.

Answer:

False

Explanation:

Answer:

brain and spinal cord.

Explanation:

The two parts of the central nervous system are the brain and the spinal cord.

The process by which radioactivity is incorporated into a material and transported to the roots can vary depending on the specific radioactive material and the environmental conditions.

However, some possible processes by which radioactivity can be incorporated into materials and transported to the roots include:

1. Absorption: Radioactive ions or compounds dissolved in water can be absorbed by the roots through their root hairs and taken up into the plant's vascular system.

2. Ingestion: If the material containing radioactivity is in the form of particles or dust, it can be ingested by the plant's root system through direct contact with the soil.

3. Uptake: Radioactive substances can be taken up by plants through a process called root uptake, where they are transported from the surrounding soil into the roots and then distributed throughout the plant.

It is important to note that the specific process of incorporation and transportation of radioactivity to the roots can depend on various factors, including the type and properties of the radioactive material, soil conditions, and plant physiology.

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Answer:

cell theory

Explanation:

Answer:

i think it's D I hope this helps :)

Answer:

D is the answer

Explanation:

Answer:

October

Explanation:

October is one of the hurricane season months

Answer:

44 cromosomas

Explanation:

Hay dos tipos principales de células en el organismo:

Diploides: Dotación cromosómica 2n. Incluye a las células somáticas y a las células germinales, que se dividen en ambos casos por mitosis produciendo dos células hijas iguales a las parentales. Las células germinales a parte también pueden sufrir meiosis, a partir de la cual generan cuatro celulas con la mitad de la carga cromósomica que las células parentales. Estas células se llaman gametas.Cuando las gametas de dos organismos diferentes fecundan, se forma el zigoto con doble carga cromosómica 2n. Este sufrirá sucesivas mitosis y originrá un nuevo organismo.

Haploides: Dotación cromosómica n. La mitad de la carga cromosómica de una célula diploide. Estas son las gametas, producto de meiosis, quienes a traves de la fecundación forman una célula diploide al sumar sus cargas cromosómicas.

Los gametos masculinos de las plantas de café tienen una carga n de cromosomas, por lo tanto son haploides. Al fusionarse con una ovocélula, con n número de cromosomas, forman un zigoto 2n, diploide. Es decir que si el gameto masculino tiene 22 cromosomas (n) y la ovocélula aporta otros 22 cromosomas, forman un zigoto diploide (2n) de 44 cromosomas. Ese zigoto sufrirá sucesivas mitosis y formará una nueva planta con celulas portadoras de 44 cromosomas.