Light аnd visiоn In sectiоn 9.4 оf the textbook, we leаrn wаys marine life uses the sun or other light producing mechanisms (bioluminescence) to eat and avoid being eaten. a) Some zooplankton undergo pretty extreme daily migrations based on sunlight. Why do they do this? When during the day are they near the water's surface, and when do they travel to depth? b) How does bioluminescence help an organism? You can give a generic response, or you can provide a specific example.