500
                            A scientist finds the fossil remains of animal A buried deep in a layer of rocks.  Then the fossil remains of animal B are found in layers of rock below animal A.  What can the scientist infer about the fossils?
A.  the fossil of animal A is older that that of animal B
B.  the fossil of animal B is older than that of animal C
C.  animals A and B lived at the same time
D.  the scientist cannot make any inferences
                            What is the fossil of animal B is older that that of animal C