How did organisms arrive at the galapagos islands?.

There are two main ways for species to make their way to remote islands (aside from any methods involving humans). The first method is by air in the form of flying or being blown by the wind, and the second method is by the sea while swimming or floating, sometimes with the aid of rafts of tangled vegetation.

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which

what is a measurement of the earth’s history divided into time periods?

> fossil record <

sedimentary rock

> geologic time scale <

radioactive elements