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(D) In an angiosperm ovule,double fertilization occurs. One male gamete fuses with the egg cell (labeled $4$) to form a diploid zygote. The other male

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$3$ and $4$

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(D) In an angiosperm ovule,double fertilization occurs. One male gamete fuses with the egg cell (labeled $4$) to form a diploid zygote. The other male gamete fuses with the two polar nuclei (labeled $3$) to form the primary endosperm nucleus $(PEN)$,which is triploid. Therefore,the contents of the pollen tube fuse with structures $3$ and $4$.

The diagram below is a longitudinal section of an ovule of an angiosperm. With which of the following structures do the contents of one pollen tube fuse?

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