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What species do some think coexisted with Homo erectus in Asia?
Primary Sex Characteristics
The physical structures directly involved in reproduction, present from birth and developed further during puberty.
Secondary Sex Characteristics
Features that appear at puberty, distinguishing two sexes from each other, not directly involved in reproduction.
Male Testes
Reproductive organs in males that produce sperm and male sex hormones, primarily testosterone.
Female Ovaries
Reproductive organs in females that produce eggs and hormones like estrogen and progesterone.
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