AP BIOLOGY

Detailed explanation-1: -The Sun: The sun is the initial source of energy, which provides energy for everything on the planet. Producers: The producers in a food chain include all autotrophs such as phytoplankton, cyanobacteria, algae, and green plants.

Detailed explanation-2: -The vast majority of energy that exists in food webs originates from the sun and is converted (transformed) into chemical energy by the process of photosynthesis in plants.

Detailed explanation-3: -Energy decreases as it moves up trophic levels because energy is lost as metabolic heat when the organisms from one trophic level are consumed by organisms from the next level.

Detailed explanation-4: -Energy of the sun is captured by the plants and is transferred to other organisms through the food chain. Food chain is a diagrammatic representation of the feeding relationship between organisms. It also shows the flow of energy between different organisms.