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By Allan B. Cobb

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The pancreas secretes insulin and glucagon, two antagonistic hormones that together regulate blood glucose levels. Finally, there are the thymus, the pineal gland, and the ovaries and testes, which produce sex hormones. S E E A L S O Behavior; Dominance Hierarchy. Jennifer Yeh Bibilography Curtis, Helena. Biology. New York: Worth Publishers, 1989. , and William T. Keeton. Biological Science, 6th ed. New York: W. W. Norton, 1996. , Larry S. Roberts, and Allan Larson. Animal Diversity. Dubuque, IA: William C.

First, it allowed the horse’s head to flex down to the ground to get the grasses. Second, the longer back gave greater flexure for a fast running pace. When an animal like a horse or cheetah runs, one of the important parts of the running pace is the springlike flexure of the back. Some species of horses that showed these changes were Parahippus, Merychippus, 23 Human–Animal Conflicts Neohipparion, Pliohippus (the first single-toed horse), Dinohippus, Hippidion, and Equus. Hippidion and Equus lived at the same time, but Hippidion became extinct sometime in the Pleistocene.

Lexington, Kentucky. html#xtocid224361Ͼ. The Equine Studies Institute. Ed. Deb Bennett. Smithsonian Institution. Ͻhttp://www. htmϾ. Horses. PBS/Nature. org/wnet/nature/horses/Ͼ. The Florida Museum of Natural History. eduϾ. Human–Animal Conflicts population a group of individuals of one species that live in the same geographic area biodiversity the variety of organisms found in an ecosystem 24 Conflicts and controversies involving interactions between human beings, their communities, and the environment have become defining issues of our time.

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