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Unit: Ecosystems and Communities

Aligned to Science TEKS with clear Learning Outcomes, this unit covers instructional content including Habitate vs. Niche, Community Interactions, Succession, Biomes, and Ecosystem Stability.


  • 11B  Investigate and analyze how organisms, populations, and communities respond to external factors
  • 11D  Describe how events and processes that occur during ecological succession can change populations and species diversity
  • 12A  Interpret relationships, including predation, parasitism, commensalism, mutualism, and competition among organisms
  • 12B  Compare variations and adaptations of organisms in different ecosystems
  • 12D  Recognize that long-term survival of species is dependent on changing resource bases that are limited
  • 12F  Describe how environmental change can impact ecosystem stability