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 peppered moth was the most diagrammatic example of the phenomenon of industrial melanism that came to be recognised in industrial and smoke-blackened parts of England in the mid-nineteenth century ...
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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