Which of the following statements is true? acquired mutations are passed down from parent to offspring. mutations are the most fundamental way to add new genes to a gene pool. hereditary mutations are caused by external factors, such as radiation. only somatic mutations are important to evolution because they can be inherited.

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.