Question

select the correct answer from the drop - down menu
rock layers
fossil of a dinosaur
fossil of a scallop
according to this fossil record, scallops lived dinosaurs. assume no overturning took place.

Explanation:

In undisturbed rock layers, older fossils are in lower layers. Scallop fossils are in a lower layer than dinosaur fossils, so scallops lived before dinosaurs.

Answer:

before