Matter and energy move among plants, animals, decomposers, and the environment within an ecosystem. through photosynthesis, plants use sunlight, carbon dioxide, and water to grow and become sources of energy for other living things. oxygen and carbon dioxide are cycled through the atmosphere and energy is transferred from one trophic level to the next. what organism gets its energy from the plant in this food web? a) grasshopper b) hawk c) snakes d) water