Which statement describes what occurs in both animal and plant cells? a) nitrogen is used for respiration and oxygen is a waste product. b) oxygen is used for respiration and carbon dioxide is a waste product. c) nitrogen is used for respiration and carbon dioxide is a waste product. d) carbon dioxide is needed for respiration and oxygen is a waste product.

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Why does lightning travel from clouds to the ground?

Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle  can be assumed at 30 deg