There are twenty amino acids in living organisms. ten of these are referred to as essential amino acids. why are they called essential amino acids?

Look at the picture below . what does this picture represent ?

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

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