Question

which of the following questions about the origin of life on earth is most scientifically testable?
a why were the earliest life - forms created using only twenty amino acids?
b did life originate to make the universe a better place?
c was catalytic rna used by ancient organisms as a stepping stone to acquire protein enzymes?
d can simple organic molecules form spontaneously in an oxygen - free atmosphere?

Explanation:

A scientific question should be testable through experiments or observations. Option A's "Why" in the context of creation is more of a philosophical - origin question. Option B is a teleological question that is not scientifically testable as "making the universe a better place" is a subjective concept. Option C can be tested by looking for evidence of catalytic RNA in ancient - like conditions or in the fossil record related to the evolution of protein - enzymes. Option D can be tested by creating oxygen - free atmospheres in the laboratory and observing if simple organic molecules form. However, option C is more directly related to the origin of life processes at a molecular level compared to option D which is more about the formation of organic molecules in general.

Answer:

C. Was catalytic RNA used by ancient organisms as a stepping stone to acquire protein enzymes?