Answer :

If the statement is p then its negation is ~p, it means if p is true then ~p is false and vice versa.

p: Plants take in CO2 and give out O2


q: Plants take in CO2


~q: Plants do not take in CO2


r: Plants give out O2


~r: Plants do not give out O2


Now,


~(qr)=~q V ~r


Hence, Plants do not take in CO2 or do not give out O2.

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