Production of the mature sperm cells have 4 step process beginning at puberty and throughout the male's lifetime. Spermiogenesis is the final process for production of sperm where the spermatids mature into motile spermatozoa. For humans, the spermatogenesis takes 74 days to 120 days and if the transport on the ductal system is included it would take 3 months.
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A broad, flat muscle of the lower back is called the <em>"Latissimus dorsi"</em>
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<u><em>The latissimus dorsi is a very large important muscle in the back. This muscle helps perform different kinds of movements involving the arms and the shoulders.</em></u>
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Evolution
Explanation:
Evolution is the change in the inherited traits of a population from generation to generation. Mutations in these genes can produce new or altered traits, resulting in heritable differences (genetic variation) between organisms.
