PA.4. Environment and Ecology
4.1.7.A. Describe the relationships between biotic and abiotic components of an ecosystem.
4.1.7.A.1. Compare and contrast different biomes and their characteristics.
4.1.7.C. Explain the flow of energy within an ecosystem.
4.1.7.C.1. Compare and contrast the flow of energy between organisms in different habitats.
4.1.7.C.2. Explain the concept of trophic levels.