You are presented with the question "Oil is formed by layers of sediment pushing down on what?" and the following answer choices: 
- bacteria
 - nutrients
 - amoebae
 - tunicates
 - oysters
 - coral reefs
 - mussels
 - Bodily water

Now knowing that oil is formed by layers of sediment pushing down on decomposing algae and when the algae dies it is decomposed by bacteria, choose the best answer.


 

 bacteria        