Variation happens randomly in a population, which means:

An example of variation is the following:

Variations happen more often in:

Because no one can watch it happen, _______ provides scientists with proff of evolution

Evolution usually happens over _______ of years

Which statement represent the major concept of the biological theory of evolution?

Which statement best illustrate a rapid biological adaption that has actually occurred?

Adaptions always depend on the _______ in which the organisms lives

A cactus plant is adapted to living in desert biomes. The desert is the catus' _____________.

Over time, the available nutrients in the soil of one ecosystem decreases. Which adaption is most likely to develop in the plant species that live in the soil?

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