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Biologists classify organisms to organize and keep track of the enormous variety of life forms, to better understand evolutionary distances, and to examine the relationships between organisms. Life on earth is incredibly... More »

Kingdom Protista includes mostly unicellular, eukaryotic life forms that behave similar to animals, plants and fungi based upon how the organisms obtain nutrition from their environment. These creatures do not fit into o... More »

Scientists classify animals to provide a standardized system of identifying and describing organisms that exhibit similar characteristics. Despite the vast diversity of animal species on Earth, categorizing these organis... More »

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Cladograms are used to show evolutionary relationships among organisms. A cladogram consists of a line with Y-shaped branches or forks. Each branch is labeled with a special characteristic that separates the organisms to... More »

Depending upon the species, sharks rely upon a diverse range of feeding techniques to consume a wide variety of marine organisms that include large creatures with a high fat content, such as seals, and smaller aquatic li... More »

An ecological pyramid is a graphical model that illustrates the flow of energy through different forms of life in an ecosystem. The bottom level illustrates species which act as producers, harnessing energy from abiotic ... More »

According to a Rice University webpage, the five-kingdom system is a method of classifying life forms into five separate categories. The system is an expansion of the previous two-kingdom model of plants and animals. More »