Answers

1.D- The entire ocean — from the depths to the shallows — gets its oxygen supply from the surface, either directly from the atmosphere or from phytoplankton, which release oxygen into the water through photosynthesis. Warming surface waters absorb less oxygen. The oxygen that is absorbed has a more difficult time travelling deeper into the ocean. That’s because as water heats up, it expands, becoming lighter than the water below it and less likely to sink

2.A

3.D

4. D

5. B