NCES.Bio.2.1 - Analyze the interdependence of living organisms within their environments.
- NCES.Bio.2.1.1 - Analyze the flow of energy and cycling of matter (water, carbon, nitrogen and oxygen) through ecosystems relating the significance of each to maintaining the health and sustainability of an ecosystem.
- NCES.Bio.2.1.2 - Analyze the survival and reproductive success of organisms in terms of behavioral, structural, and reproductive adaptations.
- NCES.Bio.2.1.3 - Explain various ways organisms interact with each other (including predation, competition, parasitism, mutualism) and with their environments resulting in stability within ecosystems.
- NCES.Bio.2.1.4 - Explain why ecosystems can be relatively stable over hundreds or thousands of years, even though populations may fluctuate (emphasizing availability of food, availability of shelter, number of predators and disease).