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listEn to A pArt oF A DisCussion in A Biology ClAss.

why DoEs thE proFEssor sAy this
A．to show thE EFFECt oF AgriCulturE on pollinAtors.
B．to DEsCriBE thE nECtAr-proDuCing plAnts.
C．to show how stonEs improvE A gArDEn.
D．to DEsCriBE EFFECts oF plAnt DisEAsE.