What happened at the end of the Mesozoic era, but did not happen at the end of the Paleozoic era?
A. An ice age occurred.
B. There were major asteroid impacts.
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C. A supercontinent broke up.
D. There were mass extinctions.

B) asteroids hit the Earth in the Mesozoic, but not the Paleozoic.  

Explanation:

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?