First of all, put yourselves a question: What is life?
Is a DNA chain life? Is a virus crystal life? When becomes a chain of atoms enough complicated to become a molecule? And when is that molecule life?
Is it when It can replicate it selves? Or does it must have a system to breathing, water, oxygen. Is it necessary that it is built on carbon/chain/oxygen?
I think that scientists are still not agreeing on the definition. The waste numbers of different species, from viruses, bacterial, worms, parasites, insects, mammals, birds and fishes, on different places of the earth, shows us that a very long time of evolution, has been going on. We cannot tell exactly how the very first DNA molecule was formed But we know that certain circumstances made the DNA structure (if that is life) able to recreate or transformed it selves to new structures.
Some scientist claim that the can make DNA changes to new lifeforms. Others say that this is not creating new life, just cooping others lifeforms. (remember the sheep dolly?) Others says that viruses constantly reshape themselves, into new forms, much more dangerous to us than the old ones.
Sorry that I haven’t been able to answer your questions, just lying up new ones, but I think that is our part of life----trying to understand.
Bugear