Variation is the differences between individuals of the same species, caused by genetic and environmental factors. Surveys into variation give data that are continuous, which means to come in a range, ...

The top row shows variation in a zooplankton, Daphnia: the morph on the right is produced in the presence of a predator cue. The second row shows an example of dimorphic variation in horn length, ...

Quantity A is said to vary directly as another Quantity B when the two quantities A and B depend on each other in such a manner that if Quantity B is changed, then Quantity A changes in the same ratio ...