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All energy comes from the sun. Some organisms directly use this energy from the sun (producers, such as plants, which use photosynthesis to convert the sun energy into energy they can use). Other organisms, consumers, get the energy secondhand (such as rabbits, which get their energy by eating the plants). Still other organisms get their energy by eating the animals that ate the plants (such as wolves, which can get their energy by eating the rabbits). These would be secondary consumers. Energy is also lost throughout the process in the form of heat given off by the animals (the energy available decreases with every group)