Question 1
Protein synthesis on the primordial earth may have been catalyzed by ____ before the evolution of enzymes.
◦ DNA
◦ carbohydrates
◦ amino acids
◦ RNA
◦ lightning
Question 2
Reproductive isolation often occurs due to
◦ geographic separation.
◦ species incompatibility.
◦ mutation.
◦ genetic drift.
◦ natural selection.