Respuesta :

d is a sperm cell, The sperm unites with (fertilizes) an ovum (egg) of the female to produce a new offspring.
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Answer:

D is a spermatozoa (basically sperm on a microscopic level)

Explanation:

The function of sperm is to complement an ovarian egg and activate embryo development. Aka, it helps fertilize an egg to conceive a baby.

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