From Robert Silverberg’s, “Earthmen and Strangers” anthology, 1966:Earthly life has developed many methods of reproducing itself. The amoeba is content to split in half; the hydra produces a bud that develops into a new hydra; the small crustacean known as daphnia lays eggs that do not need to be fertilized in order to bring forth young daphnias. Most animals, though, rely on two sexes, female and male, one to produce eggs and the other to fertilize them.The variations within this scheme are great—take, for example, the case of the oyster, which is male at ...
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