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chapter 1 lesson 1
what is life?
Term | Definition |
---|---|
cell | the basic unit of structure and function in living things |
organism | a living thing |
unicellular | made of a single cell |
multicellular | consisting of many cells |
metabolism | the combination of chemical reactions through witch an organism builds up or breaks down |
stimulus | any change a signal in an environment that can make an organism react in some way |
response | an action or change in behavior that occurs as a result of a stimulus |
development | the process of change that occurs during an organisms life to produce more complex organisms |
asexual reproduction | a reproductive process that involves only one parent and produces offspring that are genetically identical to the parent |
sexual reproduction | a reproductive that involves two parents that combine their genetic material to produce a new organism which differs from both parents |
spontaneous generation | the mistaken idea that living things arise from nonliving sources |
controlled experiment | an experiment in which only one variable is manipulated at a time |
autotroph | an organism that is able to capture sunlight or chemicals and use it to produce its own food |
heteroph | an organism that cannot make its own food and gets it food by consuming other living things |
homeostasis | the condition in which an organism's internal environment is kept stable in spite of changes in the external environment |