Fossils give scientists information regarding the living conditions and characteristics of organisms that were found on the earth thousands of years ago. how can scientists use the fossil record to provide evidence that evolution of organisms has occurred over time? a. older fossils are found in deeper layers of undisturbed rock strata. b. fossils of all life-forms can be found in rock layers. c. all fossils were formed at the same time. d. fossils can provide a complete record of human evolution.