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, ...

A characteristic of any species with only a limited number of possible values shows discontinuous variation. Here are some examples: For any species a characteristic that changes gradually over a ...

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, ...