When scientists replace a gene (DNA) from one species with the same gene (DNA) from a different species, the same amino acids will be produced. This happens because
a) all organisms have nucleic acids, so they all produce amino acids
b) all organisms have DNA, so they produce the same biological molecules
c) organisms use DNA to replicate, and RNA to store the genetic information
d) all organisms share a common ancestor, so thier genetic code is universal