The atmosphere has 4 layers: the troposphere that we live in near the surface of the earth; the stratosphere that houses the ozone layer; the mesosphere, a colder and lower density layer with about 0.1% of the atmosphere; and the thermosphere, the top layer, where the air is hot but very thin.
<u>Nitrogen</u> is found in proteins but not in carbohydrates. It is present in all amino acids as it the building block of amino acids.
(by Benjemin)
Alcohol can pass directly into the bloodstream from the mouth or stomach is a true statement.
On consumption of alcohol it travels from mouth to stomach, then into the circulatory system, kidney, liver, lungs and brain. Alcohol being a small molecule does not need any digestion in stomach and passes to the bloodstream directly in an empty stomach. When food is present in stomach, the absorption rate is reduced but is not stopped.
Once the alcohol is in the bloodstream, it gets evenly distributed throughout the body.
the third statement is wrong. Parenchymal cells have thin walls and the nuclei are not visible.
