Why can't dna, rna, and proteins be used to compare only dead organisms?

I am not too sure, but I believe it is because DNA is actually apart of living organisms along with Protein. So it can't only be compared with dead organisms but they can be living.

Hope this helps!

answer; /// i believe that the correct answer is (50%);

several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.