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Vadim26 [7]
3 years ago
6

HELP!!!

Biology
1 answer:
Phoenix [80]3 years ago
3 0

There's been a lot of bad news for polar bears recently. In 2007, for example, scientists reported that if global warming continues unabated, the population could drop two-thirds by 2050.

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A period of mass extinction is often followed by ________.
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A. 3

B. 4

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1. Integumentary system.

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