Biology vocabulary

Biology vocabulary - Term Definition Unicellular Having or...

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Term: Unicellular Definition: Having or consisting of only one cell. Term: Multicellular Definition: Having or consisting of many cells or more than one cell to perform all vital functions. Term: Asexual Reproduction Definition: A form of reproduction that does not involve meiosis, ploidy reduction or fertilization, and the offspring is a clone of the parent organism;because of no exchange of genetic material. Term: Sexual Reproduction Definition: A mode of reproduction involving the fusion of female gamete (ovum) and male gamete (spermatozoon), which forms a zygote that potentially develops into genetically distinct offspring.
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Term: Homeostasis Definition: The tendency of an organism or a cell to regulate its internal conditions, usually by a system of feedback controls, so as to stabilize health and functioning, regardless of the outside changing conditions Term: Evolution Definition: The change in genetic composition of a population over successive generations, which may be caused by natural selection, inbreeding, hybridization, or mutation. Term: Ecology Definition: A branch of biology that deals with the distribution, abundance and interactions of living organisms at the level of communities, populations, and ecosystems, as well as at the global scale. Term: Decomposer Definition: An organism whose ecological function involves the recycling of nutrients by performing the natural process of decomposition as it feeds on dead or decaying organisms.
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Term: Energy Pyramid Definition: A graphical model that is shaped like a pyramid to show how the energy flows through a food chain, how the amount of energy is decreasing and becoming less available for organisms as it enters each trophic level, and how much of the energy in the ecosystem is lost to the atmosphere as heat. Term: Trophic Levels Definition: Positions of organisms in a food chain. Term: Food Chain Definition: A feeding hierarchy in which organisms in an ecosystem are grouped into trophic (nutritional) levels and are shown in a succession to represent the flow of food energy and the feeding relationships between them. Term: Food Web Definition: Many food chains linked together to show a more accurate model of all possible feeding relationships of organisms in an ecosystem.
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Term: Conservation of Matter Definition: The principle that the total amount of energy in a closed system remains always the same, none being lost or created in any chemical or physical process or in the conversion of one kind of energy into another, within that system. Term: Nitrogen Fixation Definition: The incorporation of atmospheric nitrogen into ammonia by various bacteria, catalysed by nitrogenase. Term: Nutrient Cycles Definition: The circulation of nitrogen; nitrates from the soil are absorbed by plants which are eaten by animals that die and decay returning the nitrogen back to the soil.The environmental circulation of [[nitrogen, which passes through the food chain, the soil and the open air environment.
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