Mutations and chromosomal crossover.
Because if something breaks, it needs to know how to fix itself. It'd be no good using someone elses DNA as it would be incompatible.
All DNA is different. DNA defines everyone and everything differently. Like a fingerprint, not one is alike
That is entirely his business and no one elses.
just like you find every one elses key. you have to go fishing
is just like everyone elses.
the things that they did for fun were very simple like walking in someone elses footprints, a common one is cave painting or following myths.
That is her business and no one elses.
you evolve it by trading for some one elses shelmet
I will say that you should just be strait out and go face that person and ask for a DNA test. because it is not fair if you are supporting someone elses kid.
It is not ethical or legal to put someone else's DNA into your body without consent. It could also carry health risks and complications, as the body might recognize the foreign DNA as an invader and trigger an immune response.
probably just like everyone elses
There is no plural of DNA. If you want to be extremely explicit, one might say "DNA molecule" for singular and "DNA molecules" for plural (or something similar), but the letters DNA can refer to one DNA molecule or all DNA molecules on Earth. It really doesn't get confusing - it's like the words fish or moose. Context generally provides enough information for people to figure out whether you're referring to one DNA or a few thousand DNA.