I believe the answer is the first one, scientists must know the layers of rock, for example, a fossil was found in bedrock, The scientist should know the types of rock in it all together. hope this helped!
Buccinators are muscles in the cheek that help smiling. Laris oculi are muscles helping close eyelids. Orbicularis oris is a muscle that helps manipulate the mouth: the correct answer is D. all the above are muscles that help facial expression.
