Living Things
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| single-celled organism | the first living things to evolve on Earth were
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| metabolism | the sum of all chemical activities essential to life
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| stimulus | any change in the environment of an organism
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| response | reaction of an organism to a stimulus
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| reproduction | process by which an organism produces offspring
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| asexual reproduction | reproduction involving only one organism
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| asexual reproduction | offspring identical to parent
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| sexual reproduction | reproduction involving both a male and female parent
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| sexual reproduction | offspring will be unique---possessing a combination of traits from each parent
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| sun | the primary source of energy for almost all living things
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| requirements of all organism | food, water, living space, and energy
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| homeostasis | the ability of an organism to keep conditions constant inside its body when the outside environment changes
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| carbon | most inorganic compounds do not contain
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| organic compounds important to life are | carbohydrates, fats, oils, proteins, enzymes and nucleic acids
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| dna and rna | the nucleic acids that carry information that controls the building of proteins
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| dna | the blueprint for life
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| dna | directs the development of an organism's offspring
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| photosynthesis | earth's early atmosphere was changed dramatically by the evolution of
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| spontaneous generation | the theory that life could spring from nonliving matter
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| digestion | the building up and breaking down of chemical substances necessary for life
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| dna | the complex compound that carries the information needed to make proteins
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| competition | the struggle among lving things to obtain the resources need for survival
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| respiration | the process of combining oxygen with the products of digestion to produce energy
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| oxygen | green plants produce this waste product during photosynthesis
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| excretion | the process of getting rid of body wastes
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