Well in my learning you most commonly need A. DNA genes for cloning. You need this because starting from non life works but you could clone a dog a few weeks before its death or even years in advance. However, in my opinion I think cloning is a very sick and twisted thing! playing God is bad and extremely devilish!
Goal is to slow down or cure the genetic disease by repairing the damaged gene that caused the disease.
The layers on the top may be younger, while the bottom layers may be much older.
