Texas Essential Knowledge and Skills Teaching Resources

Science 3.9

Organisms and environments. The student knows and can describe patterns, cycles, systems, and relationships within the environments. The student is expected to:

  • (1) observe and describe the physical characteristics of environments and how they support populations and communities of plants and animals within an ecosystem;
    • (A) identify and describe the flow of energy in a food chain and predict how changes in a food chain affect the ecosystem such as removal of frogs from a pond or bees from a field; and
    • (B) describe environmental changes such as floods and droughts where some organisms thrive and others perish or move to new locations.


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