As you go deeper in the ocean, the following typically DECREASE:
- Temperature - Temperature generally decreases with depth in the ocean.
- Phytoplankton - Phytoplankton, which rely on sunlight for photosynthesis, tend to decrease in abundance as you go deeper where there is less light.
- Sunlight - Sunlight decreases with depth in the ocean due to absorption and scattering by water.
Pressure, on the other hand, increases with depth in the ocean.
So, the correct answers are: Temperature, Phytoplankton, and Sunlight.