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,
~(qᴧr)=~q V ~r
Hence, Plants do not take in CO2 or do not give out O2.
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