Organisms that cause disease are carriers. Such as ticks, fleas, lice.
The other answer is wrong. It would be pollution. Hope this helps you!
Bacteria were first observed by the Dutch microscopist Antonie van Leeuwenhoek in 1676
<u>-TheUnknownScientist</u>
Phenotypes are the physical makeup of a living thing and genotypes are the genetic makeup of the living thing
Polypeptide chains undergo some modifications before they become fully functional. Some of these modifications include: proteolytic cleavage, lipidation and glycosylation. Proteolytic cleavage refers to the removal of some amino acids from a polypeptide chain by proteases in order for the protein to become active. An example of a substance that is modified through this process is insulin.