Are the backbones of DNA molecule identical in all living things?

Hi

Explanation:

For each child, different sets of genes are passed on from the parents, resulting in unique DNA for each child. This means that even though the genetic code for all human beings is 99.9% identical, no one has the exact same DNA code except in the case of true identical twins.

Yeah I think so because animals have Sugar and Phosphate groups like humans.

Explanation:

I'm pretty sure this is right. This is what I put on my paper lol

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%