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, and marine fossils found in the interior of the continent. Given these facts, why are marine fossils in the interior of a continent among the following options:
- erosion from rivers
 - It used to be covered by water
 - They evolved to be land animal
 - basic building blocks of life
 - They washed ashore
 - the wearing away of rock
 - Land animals ate them
 - units of heredity


 

  It used to be covered by water       