Answer:
Viruses are <u>non - living things</u> that can only survive and reproduce by infecting living cells.
<u>Host</u> is an organism that shelters and nourishes others.
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a. respiration of living organisms
D. absorption of CO2 from the atmosphere by ocean water
2 and 3 are too similar to distinguish because they both are saying it's been back up on several different accounts but 3 seems like a more solid answer go with 3
