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| remains of living thing from an earlier time |
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| the relationship between the ages of sedimentary rock layers |
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| changes in the inherited features of organisms over time |
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| a group of organisms that look alike and can reproduce among themselves |
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| the scientist responsible for the theory of acquired charateristics (his theory was replaced with the theory of evolution by natural selection) |
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| a model of evolution in which change is sudden and caused by mutation |
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| a model of evolution in which change is slow and caused by variation and natural selection |
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| a branch of science that studies the early stages of an organisms development |
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Definition
| a way of comparing the ages of one thing to another (lower rock layers are older than upper layers) |
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| a type of absoluting dating based on the amount of radioactive material in a rock that has become nonradioactive |
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| ancient tree sap that sometimes traps and preserves ancient organisms |
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| body parts that are similar in origin and structure (bat's wing vs. whale's flipper vs. human arm) |
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Definition
| body parts that are reduced in size with no apparent function (human appendix, banana seeds) |
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