Key events in the rise of multicellularity in living organisms included the increase in _______ in/on Earth's _______ as a result of photosynthesis, and the evolution of _______ that enabled organisms to use _______.
A) dry land; surface; lungs; oxygen
B) water; oceans; gills; oxygen
C) oxygen; atmosphere; cellular respiration; oxygen
D) carbon dioxide; atmosphere; photosynthesis; carbon dioxide
E) prey; ecosystems; primitive brains; fermentation
Correct Answer:
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