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11 Cards in this Set
- Front
- Back
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Fossil |
the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock. |
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Superposition |
new rock forming over old rock |
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Eras in order |
(past-present) Early pre-cambration Late pre-cambration Early paleozoic Late paleozoic Mesozoic Cenozoic |
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Natural selection |
the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution. |
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Variation adaptation |
any alteration in the structure or function of an organism or any of its parts that results from natural selection and by which the organism becomes better fitted to survive and multiply in its environment. |
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Fittest |
the mechanism of natural selection. |
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Mutations |
the reproduction of genetic material does not always happen perfectly. this can result in an offspring with features that do not exist in the parents or even the rest of their species. |
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Cenozoic |
age of mammals (65 years) |
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Mesozoic |
age of reptiles (250 years) |
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Paleozoic |
age of amphibians (540 years) |
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Pre-cambrian |
(early) aquatic plants (2,500) (late) bacteria, algae (4,000) |
