What makes climate change research valid? A. Most climate change studies show variability in opinion.
B. Only a few scientists believe climate change is occurring.
C. Many lines of evidence show climate change occurring.
D. Most climate change studies are by unknown scientists.

C. Many lines of evidence show climate change occurring. makes climate change valid.

Explanation:

There is a strong scientific consensus that the Earth is warming and that this warming is mainly caused by human activities. This consensus is supported by various studies of scientists' opinions 

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carbon atoms, hydrogen, oxygen, and nitrogen.