Page 142 - Science Course 3 (Book 2)
P. 142
Mo11-L5: Key Concept Check
Direction: Put a check mark in the space that correctly identif es what rock and fossil evidence reveal
about the Paleozoic era
When It Happened
What Happened Early Middle Late
Paleozoic Paleozoic Paleozoic
1. Seventy percent of all life-forms on
land become extinct.
2. All life is in the oceans.
3. It is the age of invertebrates.
4. Heavily armored f sh evolve.
5. Reptiles evolve.
6. Cockroaches, dragonf ies, and other
insects evolve on land.
7. Dense forests grow along shallow
inland seas.
8. It is the age of f shes
9. New life-forms evolve along coral
reefs.
10. It is the age of amphibians.
11. Ninety-f ve percent of marine life
becomes extinct.
12. The f rst plants appear.
13. Coal swamps form.
14. The largest mass extinction in Earth’s
history occurs.
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