In this example, he provides a convincing blend of science and imagination that yields insight into a wholly alien race. He took a degree in physics at the University of Minnesota before turning to science fiction, and keeps abreast of the latest technical developments in a way that gives his stories the solid ring of authenticity. Poul Anderson, a lanky chap of Viking descent who lives in California, is better qualified to make scientific speculations than most of his colleagues. Given such biological variations, it was inevitable that science-fiction writers would begin to speculate about the unearthly aspects reproduction might take among alien beings.
The variations within this scheme are great-take, for example, the case of the oyster, which is male at one time of the year and female at another. Most animals, though, rely on two sexes, female and male, one to produce eggs and the other to fertilize them. 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.
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