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. A woman is digging under a tree on a tall mountain. She is looking for interesting rocks, and a foot down into the soil, discovers a fossilized fish skeleton. From this discovery, the woman is able to determine that ['the mountain used to be underwater', 'some bears in mountains eat fish', 'some fish can climb mountains', 'sometimes rain can move fish to high spaces']