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Sexual selection can happen in two ways: by competing with others of the same sex for access to opposite sex (intrasexual selection/male-male competition), or to attract a member of the oppsite sex with behaviors or characteristics (intersexual selection/female choice).

Intrasexual Selection[]

Selection within the same sex, often referred to as male-male competition.

Examples[]

Elephantseal

          

Bighornedsheep

         

Giraffe

             

Antler
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