premise: environments are found on the crustal surface of earth sent2: marine animals are water animals sent3: marine fossils means fossils of marine animals sent4: marine fossils are found in mountains sent5: if something used to be in the past then that something has changed sent6: if fossils of a water animal or plant are found in a place then that place used to be covered by water in the past sent7: a mountain is a kind of environment sent8: a body of water is a kind of environment.
hypothesis: the earth revolving around the sun causes leo to appear in different areas in the sky at different times of year