Texas Essential Knowledge and Skills Teaching Resources

Science 5.9

Organisms and environments. The student knows that there are relationships, systems, and cycles within environments. The student is expected to:

  • (1) observe the way organisms live and survive in their ecosystem by interacting with the living and nonliving components;
    • (A) describe the flow of energy within a food web, including the roles of the Sun, producers, consumers, and decomposers;
    • (B) predict the effects of changes in ecosystems caused by living organisms, including humans, such as the overpopulation of grazers or the building of highways; and
    • (C) identify fossils as evidence of past living organisms and the nature of the environments at the time using models.


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