Better have a microscope, because sperm are far too tiny to see with the naked eye. How tiny? Each one measures about inch from head to tail, or. Sperm, also called spermatozoon, plural spermatozoa, male reproductive cell, produced by most animals. With the exception of nematode worms, decapods. Sperm is the male reproductive cell and is derived from the Greek word (σπέρμα) sperma (meaning "seed"). In the types of sexual reproduction known as.
: The sperm
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