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Theory
A hypothesis that has been tested with a significant
amount of data, backed by strong evidence
Law
A descriptive statement or equation that reliably predicts
events under certain conditions
,Hypothesis
A testable prediction, often implied by a theory
Control
In an experiment, the standard that is used for
comparison
Experimental group
In an experiment, the group that is exposed to the
treatment, that is, to one version of the independent
variable.
Independent variable
The experimental factor that is manipulated; the variable
whose effect is being measured. Plotted on the x axis
,Dependent variable
The outcome factor; the variable that may change in
response to manipulations of the independent variable.
Plotted on the y axis
Autotrophs
Organisms that are able to make their own food
Heterotrophs
An organism that obtains organic food molecules by
eating other organisms or their by-products.
Diffusion
, Movement of molecules from an area of higher
concentration to an area of lower concentration;
requires no energy
Osmosis
Diffusion of water through a selectively permeable
membrane; moves from higher to lower water
concentration
Active transport
Energy-requiring process that moves material across a
cell membrane against a concentration difference
Botany
The scientific study of plants