Fact 1: Fossil fuels are formed from dead organisms over time.

Fact 2: Like coal, petroleum is a fossil fuel.

Given the two facts above, answer the question "What forms petroleum over time?" with the following options: 
- Organic compounds
 - dead dreams
 - a solute
 - a hydraulic system
 - dead organisms
 - ice
 - rocks
 - hydrogen and oxygen


 

     dead organisms    