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Ch 1 Life

Introduction to Living Things

TermDefinition
organism a living thing
cell the basic unit of structure and function in living things
unicellular made of a single cell
multicellular 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 the environment that can make an organism react in some way
response an action or change in behavior t hat occurs as a result of a stimulus
development the process of change that occurs during an organism's life to produce a more complex organism
sexual reproduction a reproductive process that involves 2 parents that combine their genetic material to produce a new organism that differs from both parents
asexual reproduction a reproductive process that involves only one parent and produces offspring that are genetically identical to the parent
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 its own food and gets 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
Created by: lrlong