The amino acids are a combination of

Amino acids are a combination of carbon, hydro- gen, oxygen and nitrogen.

Explanation:

All amino acids have a central carbon atom surrounded by a hydrogen atom.

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times