Answer:

Living cells require transfusions of energy from outside sources to perform their many tasks. For example, assembling polymers, pumping substances across membranes, moving, and reproducing. Some animals and also humans, obtains there energy for its cells by eating the leaves of plants; some other animals obtain energy by feeding on other organisms that eat plants. The energy stored in the organic molecules of food ultimately comes from the sun. Energy flows into an ecosystem as sunlight and exits as heat; in contrast, the chemical elements essential to life are recycled. Photosynthesis generates oxygen and organic molecules that are used by the mitochondria of eukaryotes, also plants and algae, as fuel for cellular respiration.

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