You are presented with the question "Prehistoric life is preserved in rock when what covers the remains over time?" and the following answer choices: 
- Plant growth is reduced
 - an amoebae
 - layers of sediment
 - single-celled organisms
 - loose soil
 - layers of fungus
 - layers of bone
 - layers of mucus

Now knowing that fossils are formed when layers of sediment cover the remains of organisms over time and fossils are evidence of prehistoric life that is preserved in rock, choose the best answer.


 

   layers of sediment      