The large opening at the base of the skull through which the spinal cord passes is an important clue to evolutionary relationships. it is called the

It is called The Foramen Magnum

Explanation: It is a large oval opening linking the Spinal cord and the Brain

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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.