Which lettered area best marks the area within the dna sequence where you find a site that serves as the initiation

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

As scientist had investigated evolution from a variety fields they have found

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.