Based on your knowledge of ocean chemistry, predict the feeding mode and size of organisms found in the middle layers of the ocean, and select the best explanation.

Non-photosynthetic because very little light is available; small because there are so few nutrients Photosynthetic because light is available; large in order to eat other organisms Photosynthetic because light is available; small because there is little dissolved oxygen Non-photosynthetic because no light is available; large in order to tolerate high pressure?