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      Scientific American April 1959

      The Sex Gas of Hydra

      Usually this small animal reproduces by budding, but it can also develop male and female organs for sexual reproduction. What factors determine which method of reproduction it uses?

      • By W. F. Loomis on April 1, 1959

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      More in the April 1959 issue of Scientific American
      • Germination
      • Mathematical Games
      • The Mohole
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