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Stratigraphy The study of layers of the earth’s crust
The layers are called strata
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Stratigraphy If you look at a cross section of rock
the lower layers are older rock the upper layers are younger rock.
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Stratigraphy Fossils in the lower layers are older fossils
Fossils in the upper layers are younger
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Homologous structures
These are structures that look similar in a large group of animals but may have different functions. Examples: hands in animals to the right
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Vestigial structures features of the body that may be fully functional in some animals, but with no known functions in others. Evolutionary leftovers Appendix Tail bone
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