These are traits that emerge during puberty but do not directly involve the reproductive system. They distinguish between sexes but don't play a direct role in reproduction. Examples include breast development in females and facial hair growth in males.
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The period of life when secondary sex characteristics develop and fertility is achieved.
Androgens & Estrogens: Hormones responsible for developing secondary sex characteristics; Androgens typically influence male traits while estrogens influence female ones.
Sexual Selection: A type of natural selection where certain traits increase an individual's chances of attracting mates.