Ecosystem - A community of organisms and their environment, containing biotic and abiotic factors., Biotic Factor - Living things that make up an ecosystem., Abiotic Factor - Non-living things that help sustain life in an ecosystem., Consumer - An organism that gets its energy by feeding on producers or animals that eat producers., Producer - an organism that uses energy from the sun to create its own food (green plants using photosynthesis), Decomposer - `An organisms (fungus or bacteria) that decomposes organic material., Energy Pyramid - A model showing how energy moves through a food chain., Predator - an animal that naturally preys on others., Prey - an animal that is hunted by another for food., Parasite - An organism that lives in or on another organism and derives nutrients from it., Host - An animal or plant which a parasite lives., Humus - Organic component of soil, formed by decomposed microorganisms., Topsoil - The top layer of soil where most nutrients for plants are found., Population - All the organism of one species that make up a population., Community - All the populations living in an area., Habitat - The natural home or environment of an animal, plant, or other organism., Niche - The organisms role in an ecosystem., Heterotrophs - An organism deriving its nutritional requirements from organic substances (cannot make its own food), Autotrophs - An organism able to make its own food from inorganic substances using light or chemical energy.,

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