By Allan B. Cobb
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Extra info for Animal Sciences. Hab-Pep
The crevices between the gum and teeth also harbor bacteria such as Bacteroides and Fusobacterium that can cause gum disease. Commensal organisms usually do not colonize the stomach because it is highly acidic, although some acid-tolerant lactobacilli can live there. One bacteria, Helicobacter pylori, has recently been linked with ulcer formation in some people. The normal flora of the intestines, Eschericia coli, Streptococcus, 30 Human Commensal and Mutual Organisms A microscopic image of a scabies mite.
Scientists feel that these losses are the direct result of the transformation of natural landscapes and ecosystems for farming, grazing, recreational, and residential uses. Biodiversity is lost when farmers clear land to increase crop yield, when loggers clear forests to provide lumber for houses and furniture, and when city dwellers need more land for homes, schools, and industry. Cutting oldgrowth forests has encouraged erosion on slopes and mountains. Wetlands have been drained and rivers dammed and diverted to provide water for irrigation and drinking water.
Scientists now know that nearly 98 percent of the genes in humans and chimpanzees are identical, making chimps the closest living biological relative of humans. However, there are fundamental differences between modern humans and their primate relatives. The human brain is larger and more complex, giving humankind the ability to communicate through language, art, and symbols, to walk upright, and to develop a throat structure that makes speech possible. 33 Human Evolution One of the earliest defining human traits is bipedalism, the ability to walk upright on two legs.
Animal Sciences. Hab-Pep by Allan B. Cobb