Anatomical similarities and differences between various organisms allow us to reconstruct and infer evolutionary history and descent. The bones of the forelimbs (wing or arm) of
three animals are shown in the illustration.

the bones of the forelimbs arm

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.