Chapter 1

Term Definition
organism living thing
cell basic unit of structure and function in an organism
unicellular made of a single cell
multicellular consisting of many cells
stimulus change in an organism's surroundings that causes the organisms to react
response an action or change in behavior that occurs as a result of a stimulus
development the process of change that occurs during an organism's life to produce more complex organism
spontaneous generation the mistaken idea that living things arise from nonliving sources
controlled experiment an experiment in which all identical except one
autotroph an organism that makes its own food
heterotroph an organism that cannot make its own food
homeostasis keeping body temperature
classification process of grouping things based on their simalarities
taxonomy study of new things are classifed
binomial nomenclature naming system
genus classification grouping that contains similar, closely related organisms
species group of similar organisms that can mate with each other, produce, and mate again, and produce again
evolution species gradually change over time
prokaryote cell that lacks a nucleus
eukaryote cell that has a nucleus
nucleus dense area in a eukaryote cell that contains nucleic acids

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