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Texas Essential Knowledge and Skills Teaching Resources

Science 6.12

Organisms and environments. The student knows all organisms are classified into domains and kingdoms. Organisms within these taxonomic groups share similar characteristics that allow them to interact with the living and nonliving parts of their ecosystem. The student is expected to: (A) understand that all organisms are composed of one or more cells; (B) recognize that the presence of a nucleus is a key factor used to determine whether a cell is prokaryotic or eukaryotic; (C) recognize that the broadest taxonomic classification of living organisms is divided into currently recognized domains; (D) identify the basic characteristics of organisms, including prokaryotic or eukaryotic, unicellular or multicellular, autotrophic or heterotrophic, and mode of reproduction, that further classify them in the currently recognized kingdoms; (E) describe biotic and abiotic parts of an ecosystem in which organisms interact; and (F) diagram the levels of organization within an ecosystem, including organism, population, community, and ecosystem.