Why is the endosperm in flowering plants 3n? 

A. because it is formed from 3 antipodal cells 

B. because it is formed from 2 male gametes and an egg cell 

C. because it is formed from 2 male gametes and a polar nucleus 

D. because it is formed from 1 male gamete and 2 polar nuclei

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D. because it is formed from 1 male gamete and 2 polar nuclei

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