darwin,, evolution and fossils

Created by clee40 

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13 terms

evolution

the process of change over time from simple to more complex

fossils

preserved remains or traces of ancient organisms

tendency toward perfection

Lamarck proposed that all organisms have an innate tendency toward complexity and perfection. As a result, they are continually changing and acquiring features that help them live more successfully in their environments.

artificial selection

nature provides the variations and humans select those they find useful

natural variation

differences among individuals of a species; results from mutation and sexual reproduction

common ancestor

idea that we are all related

adaptation

any characteristics that give an advantage for survival

descent of modification

small changes are passed onto generations over long period time

relative dating

helps to determine whether a fossil is older or younger than others by placing rock layers and their fossils in a temporal sequence

index fossils

distinctive fossils used to establish and compare the relative ages of rock layers and fossils they contain

half life

time required for half of the radioactive atoms in a sample to decay

carbon 14

elements used for younger than 60,000

potassium 40 uranium 238 rubidium 87

older than 100,000

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