Some organisms have variations. Two sources of these variations are

In order to prepare for a future outbreak of Ebola, a harmful virus, two vaccines were tested. In order for either of these vaccines to be effective, they must

Which action by humans has most likely contributed to climate change?

Which statement about the functioning of the human reproductive system is correct?

A Christmas tree farmer cuts down a native forest to plant Frasier fi r trees. Compared to the original forest, the newly planted Christmas tree farm will most likely be

One reason why scientists are concerned about this type of pollution is that

When a plant is in a hot and dry environment, the guard cells may close the stomate openings in the leaves. This action will directly

Destruction of ocean habitats by pollution today means that the organisms living there may not survive in the future. By polluting the oceans, humans are

Each of the cells present in a woman contains a complete set of chromosomes. The only exceptions are her

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X most likely represents

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