Animal Sciences. Hab-Pep by Allan B. Cobb

By Allan B. Cobb

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If these organisms find themselves in a suitable ecological niche, whether on the internal or external parts of the human body, they will multiply and form complex communities, or colonies, with their host. The first step in this colonization process requires the microscopic organisms to adhere to their host. If the organisms find a suitable location, they will form long-term, stable, interdependent relation- placenta structure through which a fetus obtains nutrients and oxygen from its mother while in the uterus niche how an organism uses the biotic and abiotic resources of its environment 29 Human Commensal and Mutual Organisms mutualism an ecological relationship beneficial to all involved organisms populations groups of individuals of one species that live in the same geographic area ships with other organisms in the same location and the human that harbors them.

Most of the evolution of horses was identified and traced by studying these changes in tooth shape and structure. The second major factor that affected the evolution of the horse was the emergence of more effective competitors, such as the artiodactyls (herbivores like camels, deer, and bison), and swifter predators, especially the cats with their saberlike canine teeth. These swift and efficient predators found the smaller, forest-dwelling horses to be easy prey, resulting in the swift extinction of the horses.

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