How could the Urey-Miller experiment be changed to accurately reflect our knowledge of the conditions of Earth's early atmosphere? Add carbohydrate molecules to the water. Add bacteria to the amino acids. Add oxygen to the mix of gases. Add ultraviolet radiation to the electric current.

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.

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water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.

segmented body, an exoskeleton made from chitin, and joint appendages.