Question

this diagram shows fossils in an undisturbed sedimentary rock sequence. shallower deeper which of the following fossils is youngest? select the most likely answer. turtle shell sea urchin sea star

Explanation:

Step1: Recall the principle of superposition

In undisturbed sedimentary rock layers, the youngest layers are on top (shallower), and the oldest are at the bottom (deeper).

Step2: Identify the fossil's layer position

The turtle shell fossil is in the topmost (shallowest) layer, the sea urchin is in the bottommost (deepest) layer, and the sea star is in a middle layer. Since the top layer is the youngest, the fossil in the top layer (turtle shell) is the youngest.

Answer:

A. turtle shell