Examlex
In most laboratory experiments, predators and prey held together in simple habitats exhibit repeated cycles in population sizes.
Menstrual Period
The phase in a woman's menstrual cycle during which bleeding occurs from the uterus, typically lasting between 3 to 7 days.
Sperm
Male reproductive cells capable of fertilizing a female ovum to result in pregnancy.
Reproductive Tract
The series of organs within an organism that work together for the purpose of reproduction.
Trimester
One of three divisions into which the duration of pregnancy is often divided, each lasting approximately three months.
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