Examlex
Why is underdominance so rare in natural populations?
Anus
The opening of the rectum, consisting of two sphincters, circular muscles that open and close like valves.
Rimming
An sexual activity involving the stimulation of the anal region by using the mouth and tongue.
Epididymis
A tube at the back of the testicles that stores and carries sperm.
Immature Sperm
Sperm cells that have not fully developed and are incapable of fertilizing an egg.
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