Translation: A. The The process process of of making making RNA

B. The activation of a gene that that produces a protein

C. Irreversible changes to the DNA sequence

D. The process of making proteins from RNA

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.