4. history of life on earth pt.1

Question 1

another name of layers of rock

Answer 1

strata

Question 2

there are #__ ____ since earth formed what are they and describe them

Answer 2

4 eras
1. hadean - before life evolved
2. Archean - early life and prokaryotes arose
3. proterozoic eon - first eukaryotes
4. Phanerozoic eon- we live in this eon, diversification of