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autotroph: self-feeding or producer, is an organism that produces complex organic compounds (such as carbohydrates, fats, proteins) from simple substances present in its surroundings, generally using energy from light (by photosynthesis) or ingorganic chemical reactions (chemosysthesis). Plants, algae, many bacteria heterotroph: nutrition is an organism that cannot fix carbon and uses organic carbon for growth. This contrasts with autotrophs, such as plants and algae, which can use energy from sunlight (photoautotrophs), or inorganic compounds (lithoautotrophs) to produce organic compounds suchas carbohydrates, fats, and protein from inorganic carbon dioxide. Animals, fungi, many bacteria abiotic factors: pertaining to any non-biological factors that play a role in an organism’s environment; non-living environmental factors. Example: A forest fire is an example of an abiotic factor. biotic factors: an influence or effect created by an organism; an effect of an organism’s actions within an environment source of energy (the sun): Sunlight is Earth's primary source of energy. The solar constant is the amount of power that the Sun deposits per unit area that is directly exposed to sunlight. organism (species): In biology, an organism is any contiguous living system (such as animal, fungus, micro-organism, or plant). population: A population is all the organisms that both belong to the same group or species and live in the same geographical area. community: A group of organisms or populations living and interacting with one another in a particular environment. ecosystem: An ecosystem is a community of living organisms (plants, animals and microbes) in conjunction with the nonliving components of their environment (things like air, water and mineral soil), interacting as a system. Producers are organisms, like green plants, that produce organic compounds from inorganic compounds. These are also a type of autotroph. Then green plants, for example, are eaten by consumers in this case, grazing animals like the zebra. An autotroph is an organism that makes its own food from inorganic substances. It is then eaten by a consumer if it is a plant for example. A consumer is the organisms that obtain nutrients from other organisms. This is also a heterotroph. A heterotroph is an organism that cannot synthesize their own food and must obtain it ready made. A decomposer is an organism of decay. These are also called saprobes. They break down the remains of dead animals and plants, releasing the substances that can be used by other members of the ecosystem.