Question

If reproduction is meant to be once then why are so many sperms produced

Answer 1

Because, Ovum ( female gamete) is far of reach of a sperm, and in order to reach it, there must be a large population of sperms produced to ensure fertilisation..

Another important reason is that, ovum has a outer protective covering that protects any intruder substance to fuse, therefore millions of sperms are produced at a time..

Hope it helps you...
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Answer 2

Buddy here is the answer that

Sperms have a low survival chance . They are quite sensitive to environmental factors such as PH and heat . The sperms once in vaginal orifice have to move all the way up to the Fallopian tube and only a few make it to that point ...