If the same index fossils are found in two separate rock layers, the two rock layers most
a. reveal a disconformity. b.reveal a nonconformity. c.were formed at the same time. d.were formed at different times.

C.were formed at the same time.

Explanation: 

If the same index fossils occurred in two separate rock layers, the two rock layers would probably have been established at the same time. Index fossils aid the characterizing and classify of geologic period.

its like this, "if i give a plant an unlimited amount of sunlight,then the plant will grow to its largest possible size."

hope it let me know if it does or doesn't =^-^=

a- all cells come from pre-existing cells