1. What two substances are missing from the model that would be needed to form proteins and nucleic acids? 2. Explain how the two elements identified above are transferred into living things and made into proteins and nucleic acids needed by living things.

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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.

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