Question

use what you know about relative dating to choose the correct answers from the drop - down menus. ethan determines that layer b is 3.5 million years old. due to the absolute age, he can estimate that layer a is years old.

Explanation:

Step1: Apply relative - dating principle

In relative dating, in undisturbed rock layers, the lower layers are older. Layer A is below layer B.

Step2: Select appropriate age

Since layer A is older than layer B (3.5 million years old), among 2 million, 3 million, and 4 million, 4 million is the appropriate age for layer A.

Answer:

4 million