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

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )

a. an idea which cannot be disproven!

explanation: