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Living Things

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