![]() Matter is recycled, but energy must keep flowing into the system. Examples of each type of photosynthetic organism are shown in Figure below.Ī food chain shows how energy and matter flow from producers to consumers. Only three types of organisms-plants, algae, and some bacteria-can make food through photosynthesis. Most autotrophs use the energy in sunlight to make food in a process called photosynthesis. ![]() AutotrophsĪutotrophs are organisms that make their own food. In terms of obtaining food for energy, there are two types of organisms: autotrophs and heterotrophs. Food consists of organic molecules that store energy in their chemical bonds. The chemical energy that organisms need comes from food. Where do living organisms get this chemical energy? How Organisms Get Energy: Autotrophs and Heterotrophs Energy, unlike matter, cannot be recycled, so organisms require a constant input of energy. The story of life is a story of energy flow-its capture, its change of form, its use for work, and its loss as heat. A lot of energy is also simply lost to the environment as heat. Energy is required to break down and build up molecules and to transport molecules across plasma membranes. Inside every cell of all living things, energy is needed to carry out life processes. These are obvious ways that living things use energy, but living things constantly use energy in less obvious ways as well. You can often see energy at work in living things-a bird flies through the air, a firefly glows in the dark, a dog wags its tail.
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