Why are biomes situated the way they are?

Developing Understanding: The first unit sets the foundation for the course by examining the Earth as a system with interdependent components, processes, and relationships. Students will examine the distribution of resources in ecosystems and its influences on species interactions. There is a global distribution of terrestrial and aquatic biomes - regional ecosystems - that each have specific environmental features based on their shared climate. This distribution is dynamic, and it has changed due to global climate change. Each ecosystem relies on biogeochemical cycles for survival. These cycles facilitate the acquisition and transfer of energy into usable forms, and they can be altered by human activities. In subsequent units, students will apply their understanding of ecosystems to the living world and examine the importance of biodiversity.

Enduring Understandings: Ecosystems are the result of biotic and abiotic interactions. Energy can be converted from one form to another.

Here is the AP College Board Course and Exam Description for Ecosystems: