The first genetic material on earth was probably
a. dna molecules whose information was transcribed to rna and later translated in polypeptides
b. dna produced by reverse transcriptase from abiotically produced rna
c. oligopeptides located within protocells
d. self-replicating rna molecules

d. self-replicating RNA molecules

Explanation:

RNA molecules are single stranded, not included double stranded RNA structures from self folding, and DNA molecules are double stranded. It is thus believed that RNA molecules was the original genetic material and eventually DNA evolved from RNA and overtook RNA as the genetic material given DNA enhanced stability. Thus the answer has to be RNA.

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.