Residence time is the amount of time in which a substance remains in a reservoir, such as the atmosphere. for example, the residence time of carbon tetrafluoride (cf4) in our atmosphere is more than 50,000 years. in contrast, carbon dioxide (co2) has a residence time that is much shorter. which statement best explains how the residence time of a substance affects the atmosphere? a> substances that have a longer residence time are more beneficial to the atmosphere. b> substances that have a shorter residence time make up a smaller portion of the atmosphere. c> substances that have a longer residence time will cycle faster through the atmosphere. d> substances that have a shorter residence time do not stay in the atmosphere as long.

The chemical form of energy that is useable by the cell to do work

On a backpacking trip, kenny hikes all day at a steady pace, covering 30 kilometers and burning 4000 calories. at the school track, janelle runs the 100-meter sprint in 13.5 seconds, burning 10 calories. afterward, janelle’s leg muscles are aching and she is breathing hard, while kenny maintains normal breathing all day, even though he burns 400 times more calories than janelle. which two statements offer the best explanation for this phenomenon? a. if the aerobic pathway—cellular respiration—cannot meet the energy demand, then the anaerobic pathway—lactic acid fermentation—starts up, resulting in lactic acid buildup and "oxygen debt." b. aerobic cellular respiration produces more energy, but its use is limited because of lactic acid buildup in the muscles and the resulting "oxygen debt." c. after about 90 seconds of intense exercise, the muscles become depleted of oxygen, and anaerobic respiration can no longer function to produce atp, resulting in "oxygen debt." d. the rate of energy demand determines how the muscles will obtain energy, either from cellular respiration or from lactic acid fermentation if not enough oxygen is present.

Brainlest awardhow does smoking and arterial plaques increase the risk of hypertension? (2 points) select one: a. both increase blood volume. b. both decrease blood volume.c. both expand the diameter of the blood vessels. d. both constrict the diameter of the blood vessels.