coral reef high desert oceanic trench evergreen forest
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Producers can use photosynthesis to capture energy for food webs in most ecosystems. In which ecosystem must producers capture energy from gases such as methane and hydrogen sulfide?
Possibilities:
- coral reef
- high desert
- oceanic trench
- evergreen forest

oceanic trench