Question

Which is not a factor in a fossil organism being useful as an index fossil?

a. it must be limited to a short span of geologic time

b. it must be widespread geographically

c. it must have lived through a long span of time

d. it must be abundant

Answer 1

no.c ,my friend is the right answer

Step-by-step explanation:

thanks for question

Answer 2

c. it must have lived through a long spam of time