Small, unchanged substance enter and leave the cell membrane through the process of

diffusion

Explanation:its a form of transportation through the cell membrane

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

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.