Living Things

Term Definition
organism a living thing
cell the basic unit of structure and function in an organism
unicelluar made of a single cell
multicellular crossing of many cells
stimulus a change in an organism's surroundings that causes the organism to react
response an action or behavior that occurs as result of the stimulus
development the process of change that occurs during an organism's life to produce a complex organism
Spontaneous Generation the mistaken idea that living things can arise from non-living sources
Controlled Experiment an experiment in which all factors are identical except one
autotroph an organism that makes its own food
heterotroph an organism that cannot make its own food
homeostasis the maintenance of stable internal conditions
classification the process of grouping things based on their similarities
taxonomy the scientific study of how living things are classified
binomial nomenclature the system for naming organisms in which each organism is given an unique, two part scientific name indicating its genus and species
genus a classification grouping that consists of a number of similar, closely related species
species a group of similar organisms that can mate with each other and produce offspring that can also mate and reproduce
evolution the process by which species gradually change over time
prokaryote organisms whose cells lack a nucleus
eukaryote organisms with cells that contain nuclei
nucleus a dense area in the cell that contains nucleic acids- the chemical instructions that direct a cell's activities

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