Well living is having life while biotic is pertaining, or produced by life or living organisms. :)
Yes you just have to eat a lot and exercise
The rate at which a parent atom creates daughter atoms is always constant and unique. The process of cell division is a unique occurrence that happens with eukaryotic cells. These parent atoms go through the different phases at a constant phase, but when interruptions in the divisions happen, mutations and abnormality in the cell will take place.
B) Nucleus!
Prokaryotic cells do not have a nucleus, and the Nucleus in a Eukaryotic cell are large and very hard to miss (if that matters to you!)