Men do not have all in their testes at birth. gametes ovum seminiferous tubules vas deferens

gametes

Explanation:

The gametes are the germ cells that are produced by the males and the females. The gamete in case of males is called as a sperm.Unlike females, the process fo formation of sperms continues throughout the lifetime of a male and because of this the entire reservoir of gametes is not present at the time of birth but it starts to produce itself at the time of puberty. This process of formation of sperms which starts at puberty and continues throughout life is known as spermatogenesis.

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