Scientists find the fossilized remains of a dinosaur in the bottom rock layers of a research site. they find the fossil of a mammal in the middle rock layers. what can be concluded from this evidence?

It can be concluded from the evidence found by the scientists that the fossils of the dinosaur are older than that of the mammal's.

Explanation:

If two different fossils are found in two distinct layers at distinct depths at the same spot, the fossil found in the upper layer can be said to be younger than the fossil found in the lower layer. This is because it is obvious that the fossil in the lower layer must have got buried years before the fossil in the upper layer.