How did large amounts of oxygen build up in the Earth's atmosphere? A. Animals breathed in carbon dioxide and released oxygen as a by-product of their metabolism.   B. Plants took in CO2 and released oxygen as a waste product.   C. Large amounts of gaseous oxygen were released in volcanic eruptions about 2 billion years ago.   D. A large asteroid impact about 2 billion years ago released oxygen from the asteroid's primitive rock.

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