Bacteria
Nitrogen fixing bacteria are those that convert atmospheric nitrogen to different nitrogenous ions and add them to the soil. These bacteria may either be free living in the soil, or they may develop a mutualistic relationship with some organisms, such as the nitrogen fixing bacteria that live in the root nodules of leguminous plants. An example of a genus of nitrogen fixing bacteria is the genus Azotobacter.
Niacin is another name for nicotinic acid. It is an organic compound that is synthesized in the liver. The essential amino acid that is utilized to synthesize niacin is tryptophan. To make 1 mg of niacin, your body needs 60mg of tryptophan. The biosynthesis of niacin requires riboflavin as well and vitamin B6.
The answer is D.
The process of spontaneous passive transport of molecules or ions across a cells membrane
Explanation:
this has to do with your nose the nose has a part that you can smell with called <em><u>olfactory system</u></em><em><u> </u></em> which help you to smell
That would be the epithelial tissues
