Ovary
animal and human
ovary, in zoology, female reproductive organ in which sex cells (eggs, or ova) are produced. The usually paired ovaries of female vertebrates produce both the sex cells and the hormones necessary for reproduction. In some invertebrate groups, such as coelenterates (cnidarians), formation of ovaries is associated with the seasons. Many invertebrates have both ovaries and testes in one animal, and some species undergo sex reversal.
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