Apoptosis occurs when a. cancer cells become invasive and grow into a body tissue b. sickled red blood cells block capillaries and then are cleared by the body c. mitochondria take in oxygen and sugar in a complex cellular process d. cells that are supposed to die undergo a programmed cell death as in a tadpole's tail

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.