explanation for a question or a problem that can be scientifically tested
using the senses to gather information
logical interpretation based on prior knowledge and observations
well tested explanation that unifies a broad range of observations
a logical, systematic approach to the solution of a scientific problem
standard for comparison in an experiment
factor in an experiment that researchers manipulate so that they can determine its effect
factor that changes as a result of a change in the independent variable
microscope that uses a beam of light passing through one or more lenses to magnify an object
uses electrons to produce a magnified image of objects too small to be seen with a light microscope
all of the chemical reactions that build or break down materials within an organism
change over time; process by which modern organisms descended from ancient organisms
two organisms that are so similar they can interbreed in nature and produce fertile offspring
all the organisms in a particular location, including their non-living environment
members of a species in a defined area
part of Earth that living organisms inhabit
populations of different organisms living in a defined area
double stranded nucleic acid that stores and transmits genetic information
the process by which organisms keep their internal environment relatively stable
a proposed answer to a scientific problem; an educated guess
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