The answer is C. Hope this helps.
Answer:
As evolutionary biologists have shown, this multicellularity was linked to the rise in oxygen and thus played a significant role for life on Earth as it is today. ... By producing oxygen and evolving into multicellular forms, they played a key role in the emergence of organisms that breathe oxygen.
Explanation:
Answer: to avoid problems with water supply
Explanation: power plant needs water to run
It would be spectral class M
hope this helps
