Question

In North America, what "fossils clues" in layers A and B indicate the kind of environment that existed when these rock layers were formed? How did the environment change in layer D?

Answer 1

The late Cretaceous period and environment changed due to changes in climate when the asteroid hit the planet and covered the sun rays.

Step-by-step explanation:

• As per the fossil records shown the layers A and B are the oldest and they have shells, ammonites, trilobites, and fish that shows it was underwater. The layer D is that formed by the dinosaurs and plants as in the Cretaceous period when plants on land were found.