An amino acid is usually considered as the building block of a protein, is a constituent that plays a significant function in the body. The amino acids are required for essential activities like the synthesis of neurotransmitters and hormones and manufacturing of proteins.
There are different kinds of amino acids found, however, all these amino acids possess three constituents, which are common to all the amino acids. These are an amino group, a carboxyl group, and an R group.
Answer: Abrasion
Abrasion is a geological phenomena in which weathering and erosion of the rocks or other hard surfaces by physical agents like water and wind. In this process, the surface material is scrapped, scratched and wear down by the frictional force exerted by the physical agents.
The sawing and grinding action of the rock fragments in the water is called as abrasion because here the water is the physical agent affecting the physical structure of the rock.