Read e-book online Animal Sciences. A-Crep PDF

By Allan B. Cobb

ISBN-10: 0028655575

ISBN-13: 9780028655574

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After an often extensive courtship, in which mating pairs swim or walk together, the male releases a spermatophore that consists of a gelatinous pedestal capped with a ball of sperm. The female walks over the spermatophore and picks it up with the lips of her cloaca, the common chamber into which digestive, urinary, and reproductive tracts discharge. Sperm are then stored internally in the spemathecae, where they are used to fertilize eggs that are laid later. A large number of salamander species are actually direct developing, with eggs hatching directly into miniature adults.

These include reshapings of the jaws and mouthparts, as well as a shortening of the digestive tract. The rapid and extreme nature of metamorphosis in frogs results in unusually high mortality levels during this period. Locomotion is difficult both in the water and on land because of the simultaneous presence of limbs and a tail. Amphibia Although aquatic larvae, metamorphosis, and semiterrestrial adults make up a typical amphibian life history, it is important to remember that there are numerous exceptions to this pattern.

Animal Liberation: A New Ethics for Our Treatment of Animals, 2nd ed. New York: Random House, 1990. Animal Testing In order to more completely understand biology, researchers sometimes conduct experiments on animals. Animal experimentation has a lengthy and productive history in biological research, especially in biomedicine. For example, the organ transplant pioneer Thomas E. Starzl conducted his early surgical transplantation experiments on dogs in the 1960s before successfully attempting them on humans.

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Animal Sciences. A-Crep by Allan B. Cobb


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