Whales have what seem like remnants of a pelvis and femur, What are these structures an example of?
transitional structures
analogous structures
vestigial structures
adapted structures

Answer: There is a download application/pdf and no picture

Explanation:

Answer:

F1- 100% Bb and 100% black guinea pigs

F2- 50% Bb, 25% BB, 25% bb or 75% black guinea pigs and 25% white guinea pig

Crossing a homozygous black guinea pig (BB) with a white guinea pig (bb) results in all F1 offspring being heterozygous black (Bb). The F2 generation from crossing two Bb individuals will have a genotypic ratio of 1 BB to 2 Bb to 1 bb and a phenotypic ratio of 3 black to 1 white.

When a homozygous black guinea pig with the genotype BB is mated with a white guinea pig with the genotype bb, the F1 generation will comprise entirely of Bb offspring because each parent contributes one allele to their offspring. Since black (B) is dominant to white (b), all F1 offspring will have a black phenotype.

In the F2 generation resulting from a cross between two Bb heterozygotes, we can use a Punnett square to predict the genotypic and phenotypic ratios. The Punnett square for this cross is Bb x Bb. You will find that genotypically there will be a 1:2:1 ratio (1 BB : 2 Bb : 1 bb), and phenotypically there will be a 3:1 ratio, with approximately 75% of the offspring displaying the black phenotype and 25% the white phenotype.

Darwins theory of evolution explains how modern organisms evolved over long periods of time through descent from common ancestors.  Darwin meant that different, yet ecologically similar, animal species inhabited separate, but ecologically similar, habitats around the globe.

Darwin's theory of evolution by natural selection explains that species evolve over time due to inherited beneficial traits increasing in frequency among populations, this is based on his critical observations and the principle of common ancestry.

Charles Darwin's theory of evolution has greatly enhanced our understanding of the natural world. It explains the process of evolution, which states that all living organisms are descended from earlier forms of life, and the mechanism of natural selection, which describes how species change over time. Natural selection posits that organisms with beneficial traits are more likely to produce offspring, leading to the prevalence of these traits in future generations. Darwin's extensive observations, particularly on the Galápagos Islands, were fundamental to the development of his theory. These observations, alongside his understanding of common ancestry, allowed Darwin to clarify why there is such vast biodiversity on Earth and how species can adapt to environmental changes.

The theory of evolution by natural selection answers fundamental questions in all branches of biology, from genetics to ecology, and has broad applications in fields such as agriculture, medicine, and conservation biology. It implies that present-day species evolved from common ancestors, and it explains the differences and similarities observed among organisms due to environmental pressures and changes.

Answer:

c

Explanation:

Answer:

c

Explanation:

i just took the test

This stimulant accelerates excitability by strengthening the synaptic connection at synaptic junctions by an increase in neurotransmitter levels.

The stimulants counteract the effects of weariness on both mental and physical tasks. Therapeutic doses of stimulants can cause euphoria, prolonged wakefulness, and appetite loss.

The medication is a stimulant that boosts synaptic connections by raising the quantity of neurotransmitters at synaptic junctions, which improves the rate of excitability.

This quickens the aging process. resulting in early aging. Long term, it may have an impact on cardiovascular system overall and cardiac performance.

By preventing blood flow to the liver over time, this could harm the liver. Additionally, it might have an inhibiting influence on the liver's detoxifying processes. This results in liver failure.

Muscles that oppose one another in action are said to be antagonistic. When one relaxes, the other contracts. In order to move, bones must move in unison.

The bone is dragged as one contracts and the other relaxes, shifting the bone's position to enable movement. Keep in mind that a muscle cell typically pulls in one direction.

Red blood cells are nucleus-free, have a bi-concave shape that allows them to fit through tiny capillaries to reach tissues, and have a vast surface area for delivering oxygen molecules.

Only a state of substance that is gaseous may be compressed. Because of the strong intermolecular interactions and the tightly packed molecules of solids, it cannot be squeezed at the solid state.

The way that ice affects density the density of ice is lower than that of water because of the lattice structure of the water molecules in ice.

The force that pulls water through the mains and into the pipes might lead to aircraft. The force per unit area that raises water to a height of 10 meters is equivalent to 1 bar.

To overcome the aerodynamic deterrent, there is pressure to provide a forward force. The thrust from the propeller engine ensures a constant speed that is high enough to overcome the drag.

Thus, this is the basic answers for the given scenario.

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To prevent the invasive species from entering texas freshwater ecosystem  the following steps should be taken they are described below.

Explanation:

The invasive species are dangerous to natural resources because they destroy the natural resources and ecological system.

These invasive species are controlled by the biological control and mechanical control.

Thus to prevent the invasive species from entering texas freshwater ecosystem the following steps are taken they are

Answer:Tanning Beds: UV rays

X-rays: Radiation

Cigarettes: Chemicals

I hope this helps

Explanation:

Answer: B.) UV rays  A.) radiation  C.) chemicals

Explanation: i hope this helps :)

Answer:

the answer is b.The model should show the original stem cell dividing to become a differentiated cell and another stem cell.

Explanation:

Answer:

pretty sure its B

Answer:

True

Explanation:

All living things contain cells. Both humans and onions are living things.

Answer:

True

Explanation:

All living things contain cells, even plants like onions. Interestingly, we share many of the same cells with onions.

All the different perspectives in psychology allow psychologist to look at psychological issues from different points of view. Therefore, the correct option is A.

The different perspectives in psychology represent theoretical approaches to understanding human behavior and mental processes. Some major perspectives in psychology include:

It is important to note that these perspectives are not mutually exclusive and are often used in combination to understand complex psychological issues. Therefore, the correct option is A.

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Hello again!

If plants are purebred, then they are homozygous. This means that they have the exact same genes in one pair: for example, AA. If they are both purebred, then the dominant gene will win out every time. The answer for this question, then, would be D. Here is a diagram to help you!

Final answer:

When a pure bred purple flower pea plant is crossed with a white flower one, all F1 offspring will have purple flowers. In the F2 generation, a monohybrid cross predicts 75% of offspring with purple flowers and 25% with white flowers, as purple is the dominant trait.

Explanation:

In pea plants, the flower color is determined by a dominant and recessive allele. Purple flower color is dominant (represented by 'B') while white flower color is recessive (represented by 'b'). When crossing two pure bred plants, one with purple flowers (BB) and one with white flowers (bb), all offspring in the F1 generation will be heterozygous (Bb) and exhibit purple flowers due to the dominance of the purple allele.

To determine the expected phenotypes in the F2 generation, we perform a cross between two F1 plants (Bb x Bb). From this, a Punnett square would show that the expected probability of phenotypes in the F2 generation is 75% (three out of four) with purple flowers and 25% (one out of four) with white flowers. This aligns with Mendel's monohybrid cross results, which consistently showed a 3:1 ratio of dominant to recessive phenotypes in the F2 generation.

Therefore, the correct answer to the student's question is A. 75% purple, 25% white.

Q: Why do organisms make different proteins?

You need the answer ASAP, huh? Don't worry, friend. I gotchu.

Proteins are important working molecules, or "building blocks", in all cells. They are produced in a two-step process in all organisms. DNA gets transcribed into RNA, then RNA is made into protein.

Now to get to your question, organisms make different proteins because cells come in all different shapes and sizes. Different types of cells make different types of proteins based on the jobs they have to do.

Hope this helped you out!

-Namira

All organisms have one or more chromosomes in which different fragments of DNA called genes are used to encode different proteins.

In conclusion, organisms have one or more chromosomes in which different fragments of DNA called genes are used to encode different proteins.

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Answer:

Explanation:

1. Cell specialization occurs due to the differential gene expression, it is the process which is responsible for the production of cells with different traits at different positions and at different time. This process changes cells  from simple to more specialized in  both structure as well as in function. This is all due to the differential gene expression where all cells beside containing the same gene, express different genes in different cells.

2. Cell differentiation is very important among almost all multicellular organisms. This process results in the  formation of a complex organism with different types of tissues and cells from a zygote.

Answer:

Lung

Explanation:

The fish use gills to breathe and get oxygen from, while dolphins (being mammals) use lungs to do this same function.

The structure of a dolphin that has the same function as the gills of a fish is lungs. The correct option is C.

On the side of fish heads, gills are branching organs with a huge number of capillaries, which are very small blood veins.

Water flows over the fish's gills when it opens its mouth, allowing dissolved oxygen in the water to be taken up by the blood in the capillaries.

Many aquatic species use their gills as respiratory organs to take in dissolved oxygen from the water and expel carbon dioxide.

Several species, like hermit crabs, have modified their gills to enable breathing on land as long as the environment is kept moist.

Dolphins use their lungs to breathe air, as opposed to fish, who do it through their gills.

Thus, the correct option is C.

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Option C. Neon is the gas among the options provided that is not a significant component of Earth's atmosphere, unlike Nitrogen and Oxygen, which are the two most abundant gases.

The gas that is not a significant component of the Earth's atmosphere among the choices provided is Neon (c). While Nitrogen and Oxygen are the two most abundant gases in the atmosphere, Neon is considered a minor component. Nitrogen makes up approximately 78.1% of the atmosphere, and Oxygen is about 21%. In contrast, Neon is much less abundant.

Regarding the other questions mentioned, Oxygen (d) is not considered a significant contributor to global warming as opposed to Carbon dioxide, Methane, and Nitric oxide. In terms of human body composition, Hydrogen is one of the most abundant elements. Moreover, among the compounds listed, Water vapor (H₂O), Carbon dioxide (CO₂), and Chlorofluorocarbons (CFCs) are known greenhouse gases.

Answer:

The results of a model event may not be similar enough to the results of the actual event.

Explanation:

Final answer:

The limitation of using a model to study a natural event is that it may not replicate the actual event closely enough, leading to erroneous predictions. Models are simplified representations with limited validity but are still essential for making predictions and organizing scientific studies.

Explanation:

One limitation of using a model to study a natural event is that the results of a model event may not be similar enough to the results of the actual event. Models are simplifications of real systems and as such, they cannot completely capture all the nuances and variables present in the actual system. While models can provide predictions quickly, a major disadvantage is that they could make erroneous predictions due to oversimplification or missing parameters.

It's important to understand that models are built around the results of scientific studies and can be used to make predictions about the system under study. However, all models have limited validity, and their reliability can vary. For instance, a physically based model or a computer-based model may have different degrees of accuracy and application because of these limitations.

Despite these limitations, models are essential tools in scientific research. They help to organize results and establish boundaries for studies, although they must be continually tested and compared with real-world observations to ensure their accuracy and relevance.

yes people in the third generation have cystic fibrosis .

What is cystic fibrosis?

"Cystic fibrosis is an inherited disease characterized by the buildup of thick, sticky mucus that can damage many of the body's organs".

What is probability for third generation to have cystic fibrosis?

People with only one copy of the defective CF gene are called carriers, but they do not have the disease. Each time two CF carriers have a child, the chances are: 25 percent (1 in 4) the child will have CF.

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Answer:

Chemical reactions convert reactants into products. In nonliving systems, the presence of a(n) catalyst allows the reaction to proceed very quickly and have a lower activation energy. In living systems, this functions is carried out by proteins called enzymes.

Water's special properties arise primarily from its molecular structure and the hydrogen bonding between its molecules.

Polarity: Water molecules are polar, meaning they have a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atom. This polarity allows water molecules to form hydrogen bonds with each other and with other polar substances.

Hydrogen Bonding: The hydrogen bonds between water molecules are responsible for many of water's unique properties. Each water molecule can form up to four hydrogen bonds with neighboring molecules, creating a strong cohesive force.

Cohesion and Adhesion: Cohesion refers to water molecules sticking to each other, which is due to hydrogen bonding. This results in high surface tension, allowing insects to walk on water and water droplets to form. Adhesion is the tendency of water molecules to stick to other substances, which helps water climb up plant roots and stems in a process called capillary action.

Environmental pressure:

Pressures resulting from human activities which bring about changes in the state of the environment.

Damages caused by overgrazing native and sown pastures, leading to loss of plant biodiversity and reduced crop yields.

Cactus species were under pressure from human activity, such as illegal trading, agriculture and aquaculture as well as land-use change.

Sharks must acquire food, escape predators, find mating partners and ensure the survival of their offspring.

Giraffes are quickly losing their living spaces.

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Environmental pressures for a rabbit include food scarcity and survival from predators, for a cactus it's primarily arid conditions with scarce water, sharks face pressures such as overfishing and climate change, and giraffes deal with a changing climate affecting vegetation and human encroachment on their habitat.

Environmental pressures are factors in an organism's habitat that can affect its survival. For a rabbit, these pressures may include food scarcity, predators, extreme weather conditions or changes in habitat due to human activities (for example, agriculture or construction). The rabbit's ability to hide or blend into its environment can be an important adaptation to these pressures.

For a cactus, environmental pressures consist primarily of arid conditions with sparse water resources. A crucial adaptation is its ability to store large amounts of water. Human activities that cause desertification or changes to soil conditions can also be environmental pressures.

Sharks face pressures such as overfishing, climate change that affects the temperature and acidity of ocean waters, and loss of prey due to changes in the ecosystem. Some sharks are adapted to withstand deep ocean pressure, but disturbances to their habitat present a significant threat.

Finally, for the giraffe, environmental pressures can include a changing climate that affects the types and availability of vegetation they eat, water scarcity, and predation. Human encroachment on their habitat through activities like logging is another key pressure. Their long necks, an evolutionary adaptation, aid in reaching food sources otherwise inaccessible.

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Final answer:

The amount of hydrogen in the sun will decrease over the next few million years due to the ongoing nuclear fusion of hydrogen into helium. As the sun's hydrogen supply diminishes, it will lead to an increase in brightness and size, eventually culminating in the sun evolving into a red giant and finally a white dwarf.

Explanation:

The amount of hydrogen in the sun will decrease over the next few million years. This is because the sun is currently in a stable part of its lifecycle known as the main sequence, where it is constantly converting hydrogen into helium through nuclear fusion at its core. Approximately 600 million tons of hydrogen are converted to helium each second, which releases the energy that we see as sunlight. As this process continues, the sun will eventually exhaust its hydrogen fuel, leading to significant changes in its structure and energy output.

This continuous decline in hydrogen leads to an increase in the core's helium content, causing the core to contract and heat up. Contracted and heated cores result in increased pressure and temperature, which in turn increases the rate of fusion. However, this does not create more hydrogen; rather, it speeds up hydrogen consumption and results in the sun growing larger and gradually brighter.

Ultimately, the hydrogen fuel that is hot enough for fusion will be exhausted, and the sun will go through dramatic changes, including becoming a red giant. This transformation into a red giant will mark the end of the sun's lifetime as we know it, as it will eventually shed its outer layers and leave behind a core in the form of a white dwarf, completely devoid of hydrogen fuel for nuclear fusion.

Estuaries are biomes where fresh water meets the ocean, creating a diluted saltwater environment. These areas provide habitats for various species and are influenced by salinity. Wetlands are water-saturated environments that contribute to water filtration and protect coastal lands.

Estuaries are biomes where fresh water meets the ocean, resulting in a diluted saltwater mixture. These areas provide habitats for the offspring of crustaceans, mollusks, and fish and are influenced by salinity, which is based on the flow rate of freshwater sources. The mixing of fresh and salt water in estuaries creates challenges for plants and animals, but some are able to adapt to these conditions by tolerating salty conditions or removing salt from their roots. Wetlands, on the other hand, are environments saturated with water that help filter it and protect coastal lands from storms and floods. They consist of different types, including marshes, swamps, bogs, mudflats, and salt marshes. Wetlands are characterized by their hydrology, hydrophytic vegetation, and hydric soils.

Answer: I would say E

Explanation:

Is it multiple choice? If so then these are the answers, I think...

A. Each amino acid in a protein is coded for by three bases in the DNA.

B. Each gene codes for three proteins.

C.  Each triplet has many different meanings.

Answer:The cell cycle has two major phases: interphase and the mitotic phase. During interphase, the cell grows and DNA is replicated. During the mitotic phase, the replicated DNA and cytoplasmic contents are separated and the cell divides.

Explanation: