AP BIOLOGY

Detailed explanation-1: -Producers make up the first trophic level. Producers, also known as autotrophs, make their own food and do not depend on any other organism for nutrition. Most autotrophs use a process called photosynthesis to create food (a nutrient called glucose) from sunlight, carbon dioxide, and water.

Detailed explanation-2: -The source of all energy in most ecosystems is the sun. This energy arrives in the form of sunlight, which is captured by organisms called producers. One example of a producer is a plant.

Detailed explanation-3: -Plants, algae, and photosynthetic bacteria act as producers. Producers are autotrophs, or “self-feeding” organisms, that make their own organic molecules from carbon dioxide.

Detailed explanation-4: -Heterotrophs are known as consumers because they consume producers or other consumers. Dogs, birds, fish, and humans are all examples of heterotrophs. Heterotrophs occupy the second and third levels in a food chain, a sequence of organisms that provide energy and nutrients for other organisms.

Detailed explanation-5: -Answer and Explanation: The source of energy for an ecosystem is sun. The sun is the primary source of energy in an ecosystem. The energy from sun in the form of sunlight energy is used by the green plants and other autotrophs to conduct photosynthesis.