Carbon dioxide, or CO2.
Plants produce oxygen for us to breathe, and in exchange they take the gas we breathe out: carbon dioxide.
I believe A:Both have reproductive cells with flagella
3) number of seeds and 4.) stem length
I think it may be A) Plant cycle
"severe weather conditions" are the only things than can be reasonably well predicted with the help of science. Of course the accuracy of these predictions varies greatly.
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