![]() The autotrophic bacteria oxidize these chemicals to produce energy. At cold seeps, hydrogen sulfide and methane seep up from beneath the seafloor and mix with the ocean water and dissolved carbon dioxide. Autotrophic bacteria that produce food through chemosynthesis have also been found at places on the seafloor called cold seeps. These minerals include hydrogen sulfide, which the bacteria use in chemosynthesis. The boiling-hot water then circulates back up into the ocean, loaded with minerals from the hot rock. Seawater seeps down through the crack into hot, partly melted rock below. A hydrothermal vent is a narrow crack in the seafloor. Bacteria that live in the deep ocean, near hydrothermal vents, also produce food through chemosynthesis. states of Wyoming, Idaho, and Montana, bacteria capable of chemosynthesis have been found in hot springs. For example, bacteria living in active volcanoes oxidize sulfur to produce their own food. Organisms that use chemosynthesis live in extreme environments, where the toxic chemicals needed for oxidation are found. Instead, they make food using energy from chemical reactions, often combining hydrogen sulfide or methane with oxygen. Autotrophs that perform chemosynthesis do not use energy from the sun to produce food. Some rare autotrophs produce food through a process called chemosynthesis, rather than through photosynthesis. Algae, phytoplankton, and some bacteria also perform photosynthesis. All plants with green leaves, from the tiniest mosses to towering fir trees, synthesize, or create, their own food through photosynthesis. Plants also use glucose to make cellulose, a substance they use to grow and build cell walls. ![]() In photosynthesis, autotrophs use energy from the sun to convert water from the soil and carbon dioxide from the air into a nutrient called glucose. ![]() Most autotrophs use a process called photosynthesis to make their food. Phytoplankton, tiny organisms that live in the ocean, are autotrophs. Algae, which live in water and whose larger forms are known as seaweed, is autotrophic. Plants are the most familiar type of autotroph, but there are many different kinds of autotrophic organisms. Because autotrophs produce their own food, they are sometimes called producers. An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals.
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