An exothermic reaction is a chemical reaction that releases energy by light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: reactants → products + energy.

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3 years ago

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Which cells in the body are targeted by HIV?

Sindrei [870]

T cells. When HIV arrives in the lymph nodes – around 24 to 48 hours after exposure – they activate other immune cells, such as CD4 t-cells, HIV's primary target.

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3 years ago

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A newborn child is experiencing severe heart problems and has abnormally short limbs. What could have affected cell differentiat

Angelina_Jolie [31]

I think the correct answer is option B. A newborn child is experiencing severe heart problems and has abnormally short limbs is caused by exposure to radiation. Exposure to this causes disturbance to the early development of the baby.

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3 years ago

Evolution is the

lina2011 [118]

Answer:

Evolution is the biological process that happens over time in a population, giving rise to new species. The theory of evolution states that all organisms alive on Earth today have a common ancestor which lived years ago.

Explanation:

Evolution is one of the fundamental reason of diverse life on Earth today. Principally, this process takes place by changes in genetic elements via mutations and crossing-over. The positive changes (mutations) allow the organism to develop better condition in order to survive in changing environmment. However, if the changes takes place at major scale, it also leads to the creation/development of new species. To explain this further, I have added a photograph where we can see how different organisms were evolved in the history of Earth.

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3 years ago