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olasank [31]
3 years ago
13

The graph below show the number of sunspots observed between 1750 and 2000

Biology
1 answer:
Aleksandr [31]3 years ago
6 0

Answer:A. It was a period of increased solar radiation

Explanation: I took a test and I got it right

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In conclusion, in its second messenger role, cAMP activates enzymes called kinases, whose job is to regulate other enzymes by adding phosphate groups to them.

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