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Different from ‘theory’ used in common speech, a scientific theory is not a speculative idea
Scientific theories are supported by a broad range of observations, experiments and data
Biological Theories 1 - Theory Concept Cell All organisms are composed of cells and new cells only come from preexisting cells Gene Organisms contain coded information that dictates their form, function, and behavior Evolution All living things have a common ancestor, but each is adapted to a particular way of life Homeostasis The internal environment of an organism stays relatively constant – with a range protective of life Ecosystem Organisms are members of populations that interact with each other and with the physical environment within a particular locale
1.8 Control groups allow for comparison of results
When performing an experiment, the environmental conditions must be kept constant, except for the experimental variable , which deliberately changes
Test groups are exposed to the experimental variable