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Aggressive or defensive social behavior (fighting, fleeing, submitting) between individuals of the same species
Structures in two or more organisms that preform a similar function but are not derived from a common ancestor
uterus characteristic of simple primates. Two uterine horns can serve as a site for implantation of an embryo
point on the chin where two dentary bones meet, can spread in rodents, get things out of teeth
period of heightened hormone levels, increased aggression and sexual activity, discharge form temporal gland
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