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Certain jellyfish, sea lion anemones, marine worms, and other lowly creatures
bud off parts of the body during one season or another, each thereby giving rise
to populations of new, though identical, individuals. At the microscopic level, ...
In late winter or early spring, a new generation of hydras develops, each
individual becoming attached to a stone or vegetation and feeding on small
crustaceans by means of its long slender tentacles. The daphnias, or so-called
water fleas, ...
Sex hormones, male of cycles or female, respectively, are produced by the
gonads themselves and cause or maintain their growth and at the same time
cause the various secondary sexual characteristics of the male or female
individual to ...
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For virtually all its 238 years,Britannica has ruled the shelves as a peerless general encyclopedia. Reviewers have consistently given it high marks for most of the 12 criteria identified inKister's ... Read full review
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