Recognize that all animals require food, water, air, shelter, and room to survive. Understand that living systems require energy from food to survive. Know that living systems require energy from food to survive. Know that living systems require energy from food to survive. Energy stored in food is primarily derived from the sun through photosynthesis.
Respiration takes place in all cells releasing energy stored in food.
Know that the energy for life is primarily derived from the sun. Know that the energy for life is primarily derived from the sun through photosynthesis. Know that the distribution and abundance of organisms and populations in ecosystems are limited by the availability of matter and energy. Know that atoms and molecules cycle among the living and nonliving components of the biosphere. Know that organisms both cooperate and compete in a food chain.