I'm pretty sure it was yellow fever.
The organ that living things such as fish use to extract dissolved oxygen from water are the gills. As land animals and humans don't have gills, we can't breath underwater and take in the oxygen from that source.
Answer:
b. Photosynthesis
Explanation:
Photosynthesis is the process by which producers make their own food from raw materials: carbon dioxide and water in the presence of sunlight.