The R-group (side chain) is what makes each amino acid unique. Each of the 20 amino acids has a different side chain structure.
Answer:
.......is called chemical compound
Multicellular organisms arise in various different ways, for example by cell division or by aggregation of many single cells.
I believe it is A because I know Nonpoint source pollution can include excess fertilizers, herbicides and insecticides from
Agricultural lands and residential areas. I hope it is right.. please let me know