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chapter 1 lesson 1

What Is Life?

organism a living thing
cell the basic unit of function and structure in living things
unicellular made of a single cell
multicellular consisting of many cells
metabolism the combinations of chemical reactions through which an organism breaks down or builds up materials.
stimulus Any change or signal in the 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 a more complex organism.
asexual reproduction A reproduction process that involves only one parent and produces offspring that are genetically identical to to the parent.
sexual reproduction A reproduction process that involves two parents that combine their genetic materials to produce a new organism which differs from both parents.
spontaneous generation the mistaken idea that living things arise from non-living 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 it's own food.
heterotroph An organism that cannot make it's own food and gets food by consuming other animals.
homeostatis the condition in which an organism's internal environment is kept stable in spite of changes in it's external environment.
Created by: 0005836