Twenty-five-year-old jonah is wondering whether his rate of sperm cell production is within normal range. for a man his age, his doctor will likely tell him that the average rate of production is about sperm per second.

1000 sperm per second

Explanation:

Spermatogenesis is the process through which sperms are produced, testicles constantly produce sperms in the male body but the whole process takes almost 64 days normally.

For a man of age 25 the normal range of production of sperm per second is 1000. However, at the end of the cycle of sperm production that is after 64 days, 8 billion sperms are regenerated.  

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b.have there own function.