You are presented with the question "what fossils have to be found in a place to signify the place used to be covered by water?" and the following answer choices: 
- bullfrogs
 - Sediment
 - Sea urchins
 - dinosaurs
 - barnacles
 - humans
 - patch reefs
 - natural gas

Now knowing that 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 barnacles are animals that live in the water, choose the best answer.


 

     barnacles    