What are the two most important properties of a telescope? select exactly two responses?

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

Several billion years ago which gas was the least prevailant in the atmosphere