To protect endangered species from becoming extinct, it’s highly recommended to raise the animals in protected areas such as zoos and wildlife sanctuaries. Although this step could protect them, what challenges do the animals face when these methods are used?

thinking it would be d not too sure but i think it's right

digestion

it excretes wastes

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.