Fact 1: Oil is formed by layers of sediment pushing down on decomposing algae.

Fact 2: When the algae dies it is decomposed by bacteria.

Given the two facts above, answer the question "Oil is formed by layers of sediment pushing down on what?" with the following options: 
- bacteria
 - nutrients
 - amoebae
 - tunicates
 - oysters
 - coral reefs
 - mussels
 - Bodily water


 

 bacteria        