Animal Sciences. A-Crep by Allan B. Cobb

By Allan B. Cobb

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Roberts, and Allan Larson. Animal Diversity. Dubuque, IA: Wm. C. Brown, 1994. 32 Antibody Antibody Antibodies are protein molecules that function in the body’s immune response. They are present throughout the circulatory and lymph systems, and are therefore exposed to all tissues in the body. An antibody is able to recognize and bind to a particular offending antigen. ” Invaders such as bacteria, viruses, fungi, toxins, and other foreign substances generally carry a variety of antigens on their surfaces.

Scientific American 276 (February 1997):80–82. , and Adrian R. Morrison. ” Scientific American 276 (February 1997):83–85. Annelida ecosystems selfsustaining collections of organisms and their environments The phylum Annelida includes three main groups: the earthworms, the leeches, and the bristleworms. Annelids are found worldwide, and inhabit terrestrial, freshwater, and marine ecosystems. There are over 15,000 described species. coelom a body cavity epidermis the protective portion of the outer portion of the skin found in some animals, it is composed of two layers of cells where the outer layer is continuously shed and replaced by the inner layer chitin a complex carbohydrate found in the exoskeleton of some animals exoskeletons hard outer protective coverings common in invertebrates such as insects mesoderm the middle layer of cells in embryonic cells hydrostatic skeleton a pressurized, fluid-filled skeleton 30 Characteristics of Annelids All annelids are segmented.

And Sandra L. Vehrencamp. Principles of Animal Communication. Sunderland, MA: Sinauer, 1998. Campbell, Neil A. Biology, 3rd ed. San Francisco, CA: Benjamin/Cummings Publishing Company, 1993. Maynard Smith, J. Evolution and the Theory of Games. : Cambridge University Press, 1982. Agnatha The group Agnatha consists of the jawless fishes, the most primitive group of extant vertebrates. While most agnathan species are now extinct, fossil evidence indicates that the group was once highly successful and extremely varied.

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