Which of the bonding examples below is not possible?
(a) a dna adenine to a dna thymine
(b) a dna adenine to an rna thymine
(c) a dna guanine to an rna cytosine
(d) a dna adenine to an rna uracil
(e) a dna guanine to a dna cytosine

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent