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When Conditions Are Harsh, Often Before Winter Or In Poor Feeding Conditions, Sexual Reproduction Occurs In Some Hydra. Swellings In The Body Wall Develop Into Either Ovaries Or Testes. The Testes Release Free-Swimming Gametes Into The Water, And These Can Fertilize The Egg In The Ovary Of Another Individual.

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When conditions are harsh, often before winter or in poor feeding conditions, sexual reproduction occurs in some Hydra. Swellings in the body wall develop into either ovaries or testes. The testes release free-swimming gametes into the water, and these can fertilize the egg in the ovary of another individual.

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