Can someone please help mee?!!

When ash and dust begin to settle on the ground, they eventually become compacted by

Pulmonary arteries carry highly oxygenated blood. true or false?

5. what might happen if you were to remove all light from the setup after the discs have all become buoyant? describe what you would see. explain why this would occur with relation to cellular processes like respiration. [referring to an ap biology lab in which spinach discs are placed in a sodium bicarbonate solution and exposed to light.]