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, ...

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, ...

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 ...