Mutations supply different traits.

Living things best adapted to their environment usually do not survive

If animals become isolated in an environment, their evolution slows down. These animals do no change quickly.

We can find out how old fossils are by radioactive dating and by studying the layers of rock and earth

________________are traits controlled by genes which help in survival.

______________means change over time.

Any remains or signs of living things from ages past could be called _____________.

The picking or choosing of a trait is sometimes called __________________.

A similar structure such as forelimbs of bats, birds, whales and humans that support the idea of common ancestry is a __________________ structure.

The more similar organisms are to one another, they will have similar DNA sequences.

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