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.

false because ozone (o3) depletion does not cause global warming, but both of these environmental problems have a common cause: human activities that release pollutants into the atmosphere altering it.

global warming is caused primarily by putting too much carbon dioxide into the atmosphere when coal, oil, and natural gas are burned to generate electricity or to run our cars.

explanation:

what are the options? add them, then i will be glad to .