In the apple maggot fly, Rhagoletis pomonella, the frequency of certain alleles increases steadily as one goes from north to south. This is an example of

The right answer is c.sandstone.

Calcinosis is the diagnostic term that means an abnormal buildup of calcium on the kneecap (patellar) surface. it is a term uses to describe a group of disorders in which calcium deposits form in the skin. it is also referred to the abnormal deposit of calcium phosphate.

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