Life and Letters
Skeletal System, Skin, & Scales Chapter 3
The Placodermi were a class of armored prehistoric fish, known from fossils, which lived from the late Silurian to the end of the devonian Period.
2 types of evolution Macroevolution Changes beyond the species Examples: -Biogeography -Fossil record -Homology -Biochemical similarities -Chromosomal.
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2 types of evolution
