Outside the plasma membrane there is presence of glycoprotein which is a series of polysaccharides to form the cell coat and is used for ID or cell recognition. Each individual has a unique special code for the glycoprotein.
Answer:
Warm air rises at the equator and moves toward the poles. At the poles, the cooler air sinks and moves back toward the equator.
This is called erosion, whats happening is water is decomposing parts of the rock at a time by going down from tiny holes in the rock then decomposing.
Hope I could help. :)
Proteins are made up of chains of small organic molecules called amino acids such as glycine, alanine, lysine or tryptophan.