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chapter 1 lesson 1
what is life?
Term | Definition |
---|---|
cell | the basic unit of structure and function in living things |
organisms | A living thing |
unicellular | made of a single sell |
multicellurlar | consisting of many cells |
metabolism | the combination of chemical reactions through which an organism builds up or breaks down materials |
stimulus | any change or signal in 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 |
asexual reproduction | a reproductive process that involves only one parent and produces offspring that are genetically identical to the parent |
development | the process of change that occurs during an organisms life to produce a more complex organism |
sexual reproduction | a reproductive process 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 energy from sunlight or chemicals and use it to produce its own food |
heterotroph | an organism that cannot make it's own food and get's 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 exterinal environment |