Examlex
Because there are costs to migration:
Sperm
The male reproductive cells capable of fertilizing a female's egg to produce offspring.
Egg
The female reproductive cell or gamete in animals and plants; an ovum.
Vagina
A muscular tube connecting the external genitals to the cervix of the uterus in females, part of the reproductive system.
Menstrual Flow
The discharge of blood and tissue from the lining of the uterus that occurs in the absence of pregnancy.
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