Warm Up 1/17/08. What important event in animal evolution marks the beginning of the Cambrian? a. the ability to fly b. the ability to swim c. the appearance of fossils d. the appearance of hard parts What event may have triggered the great Paleozoic extinction?
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a. the ability to fly
b. the ability to swim
c. the appearance of fossils
d. the appearance of hard parts
a. climatic change
b. heightened solar activity
c. meteorite strike
d. changes in Earth’s orbit
a. 2 billion years c. 2 million years
b. 292 million years d. 29 million years
Answers: 1) d. 2) a. 3) b.
Chapter 13, Section 4