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In sea urchins and amphibians, fertilization is external
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Sexual reproduction: oogenesis and folliculogenesisSexual reproduction: conjugationProcreationAsexual reproductionSexual reproduction: gametogenesisSexual reproduction: spermatogenesisEmbryonic development of Drosophila.Embryonic development in sea urchinsModel organism DrosophilaUse of embryonic stem cells and ethicsGametogenesis