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Speciation :D
It is called speciation.
Population isolation of some sort.
stratificatin
A Population Pyramid! :)
Generally, because they represent a specific segment of the overall population. Not everyone is handicapped, so an interest group representing them would be a "special" interest group because bills/policies affecting them would not affect the general population, per se.
unification
Clay and Quartz!
The vertical rows on the periodic table are called groups.The vertical rows are called periods and the horizontal columns are called groups.
Generally, because they represent a specific segment of the overall population. Not everyone is handicapped, so an interest group representing them would be a "special" interest group because bills/policies affecting them would not affect the general population, per se.
when members of two separated groups of a population can no longer interbreed, the two groups are members of different what
In the Stone Age, the Earth's population was supported by small groups called Hunter-Gatherers.