Amount of wear, and how long they are may contribute with age and maybe even coloration and pigment.
Answer:
I think the answer is "Steno's principles".
Explanation:
The correct answer is C. Virus.
Virus falls on the gray area which is between nonliving and living things.
Virus is referred to as the small infectious agent which replicates only inside the living cells. Virus can infect life forms plants and animals and microorganisms, for example, archaea and bacteria.
They live in form of independent particles which are referred to as virions. Some viruses can evolve from plasmids.
