The top row shows variation in a zooplankton, <i>Daphnia</i>: 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 ...

There are two types of variation - continuous and discontinuous. Find out more with Bitesize. For students between the ages of 11 and 14.

Over the past 15 years, phylogenetic comparative methods (PCMs) have become standard in the study of life-history evolution. To date, most studies have focused on variation among species or higher ...