if fossils of an aquatic animal or plant are found in a place then that place used to be covered by water in the past & a whale is a mean of lever plant ->  if fossils of fish are found in a place then that place used to be covered by water in the past  if fossils of fish are found in a place then that place used to be covered by water in the past & fossils of fish are found on the land & a water is a mean of thing -> the land used to be covered by water in the past