Answer:
The human body is comprised of trillions of cells. Over 200 types of cells make up the organs, bones, muscles and nervous system. All the cells have similarities, such as a membrane on the outer surface and organelles--structures that perform cellular functions--within the cell.
If replication of DNA does not maintain accuracy there will be mutations. Not all mutations are bad.
-A-A-A-T-G-C- because only one base pair is altered by the mutation
Bacteria have been the very first organisms to live on Earth
