Please help me with this question

How many cells are our body made of ? ♡

Matthew decided he wanted to hike up mount everest. on his way to the top, it began to snow and the temperature dropped to -10°f. matthew forgot to wear a heavy jacket so his body began to shiver beyond control. in this case, matthew's body shivering is the to a drop in temperature. * 0 points reflex stimuli responce environmental facto

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?