You want to see if mold grows faster on bread in the shade that on bread in the sun your experimental variable is_

trachea, alveoli, lung capillaries, arteries

the answer is :

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.