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 ...
This is a gradual change in a characteristic across a population, it could be human height, mass and shoe size. Human beings have one of four blood groups, A, B, AB or O. There are no values in ...
ON September 24, some years ago, I collected at Mesilla, New Mexico, four examples of a wild bee of the genus Epeolus, the species being probably identical with Epeolus bardus of Cresson. In every one ...
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