If allopatric speciation is the most prevalent mode of speciation, what do you predict about the geographic distributions of many closely related species? Does your answer differ for species that are sedentary versus species that are highly mobile?

It is likely that the emergence of geographical barriers among populations (such as for example, rivers, mountains, etc.) were responsible for the isolation of these species.  

Explanation:

The presence of geographical barriers among populations ensure that they begin to evolve independently and mechanisms of reproductive isolation will appear among them

b. the carbon cycle ensures living things have a source of hydrogen

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.