Biology / Unit 1 Bio 0019 short lesson, about 20 seconds
Variable
Captions available
The idea
A variable is any factor in an experiment that can change or be changed during the test.
In practice
Soil looseness is the variable the gardener manipulates; sunlight and watering schedule stay fixed.
Where people slip
An experiment with several factors changing at once cannot say which one caused the result.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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