Mitochondrial DNA can be traced for generations. It is because of the fact that unlike nuclear DNA, mitochondrial DNA rarely gets mutated. The frequency of mutations in the mitochondrial DNA is approximately one every 3,500 years per nucleotide. That is why mitochondrial DNA of a person is almost similar to his/her direct maternal ancestor. So, it can be used to match lineages amongst people.
All living things have cells, they reproduce, they more in some king of
way/ grow, and they use energy from some sort of water and food.
The answer would be the cell wall or the cell membrane
Any photos below 7 is known as acidic, the lower the pH the more acidic the solution I believe.