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Chapter 3

TermDefinition
Organism A living thing.
Cell A 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 bahavior that occurs as a result of a srtimulus.
Development The process of change that occurs during an orgainism's life to produce a more complex organism.
Asexual reproduction A reproductive process that involes only one parent and produces offspring that are genetically identical to the parent.
Sexual reproduction A reproduction process that involes two parents that combine their genetic material tp 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 cannot make its own food and gets food by consuming other living things.
Heterotroph An organism that cannot make its own food and gets food by consuming other living things.
Homeostasis The condition in which an organisms internal environment is kept stable in spite of changes in the external environment.
Classification The scientific study of how living things are classified.
Taxonomy The scientific study of how living things are classified.
Binomial Nomenclature A group of similar organisms that can mate with each other to produce offspring that can also make and reproduce.
Genus A classification grouping that consists of a number of similar, closely related species.
Species A group of similar organisms that can mate with each other to produce offspring that can also make and reproduce.
Prokaryote A unicellular organism that lacks a nucleus and some other cell structures.
Nucleus The central core of an atom which contains protons and neutrons.
Eukaryote An organism whose cells contain a nucleus.
Created by: rgrabetz00
 

 



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