Why does alcohol abuse increase tolerance to other drugs such as barbiturates?

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

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?

Moving down the ramp from 6 meters to