Whose ability to use fossils in stratigraphy was identified as a major breakthrough in sequencing rock layers?
Carl Gilbert and Willard Libby
Georges Cuvier and William Smith
James Hutton and Nicholas Steno
Stephen Calvert and Charles Lyell

amber has allowed scientists to study dna that has been preserved over millions of years.

science-ocean floors and habitats study guide by volleyballqueen3817 a major advance in ocean-floor mapping. list four sections of the ocean floor. algae that use sunlight to produce their own food through photosynthesis. all of the feeding relationships that exist in a habitat. drying out, predators, find food.