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

BAsED on thE proFEssor’s tAlk, whAt FACtors hAvE ContriButED to thE DEClinE oF pollinAtor populAtionsCliCk on two AnswErsA．pArAsitEs.
B．hunting.
C．Air pollution.
D．FArming ChEmiCAls.