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Harlamova29_29 [7]
3 years ago
13

The __________ was a period of rapid change during which the ancestors of most animal groups emerged. A layer of soot found betw

een rock layers worldwide, known as the____________, might indicate that a large meteorite collided with Earth.
Biology
1 answer:
sashaice [31]3 years ago
5 0
1) Cambrian explosion
2) K-T boundary
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