by providing habitat for large fish and plants by providing habitat for algae and small invertebrates by providing habitat for marine mammals and plants by providing habitat for bacteria and fungi
I gave my students this multiple choice question: What is the most important way an artificial reef, such as a sunken ship or railroad car, may support the development of a complex ecosystem?

Only one answer is correct among these 4 choices:
- by providing habitat for large fish and plants
- by providing habitat for algae and small invertebrates
- by providing habitat for marine mammals and plants
- by providing habitat for bacteria and fungi

Could you tell me which one is correct?

by providing habitat for algae and small invertebrates