A) 14 gigayears
B) 5 gigayears
C) 3.48 gigayears
D) 1.5 gigayears
E) 500 megayears

A) the information contained in DNA or protein sequences that shows changes over time.
B) genes that under selective pressure show a higher rate in mutation frequencies.
C) organisms in favorable environments that have greater offspring potential.
D) the time between Earth's formation and the beginnings of life in an RNA world.
E) a monophyletic group of organisms that replicate in synchrony.

A) Compared to DNA, synthesis and degradation of RNA require less energy.
B) Uracil, a pyrimidine in RNA, is the precursor of thymine, used in the synthesis of DNA.
C) Some ribozymes splice introns in mRNA.
D) Some ribozymes catalyze synthesis of complementary strands of RNA.
E) Peptide bond formation is catalyzed by ribosomal RNA.