Isabel was studying the fossil of a particular species of reptile. The fossils had been found both on the coast of Brazil and on the coast of western Africa. She could not understand how the same species existed in these two distant locations. Isabel asked her teacher for help solving this problem. Her teacher said to consider that the shape of Brazil's coast fits like a puzzle piece into the shape of western Africa. She also pointed out that the composition of some rocks along coastal Brazil is similar to that of some rocks along the coast of western Africa. Isabel's teacher thought that this physical evidence provided strong support for one explanation for the location of these fossils. Based on these hints, what conclusions can you draw to explain why fossils are being found in both places?