You are presented with the question "What can enter oceans in the form of sunlight of chemical compounds?" and the following answer choices: 
- NaCl
 - heat
 - copper
 - Energy.
 - energy
 - coal
 - Fungi
 - photons

Now knowing that energy enters ecosystems in the form of sunlight or chemical compounds and oceans are one of the largest ecosystems in the world, choose the best answer.


 

     energy    