Light, depth, and temperature affect the number and type of organisms that live in each ocean zone. The surface zone has the most light and the highest temperature, which allows for photosynthesis and supports a wide variety of organisms such as phytoplankton, zooplankton, and dolphins. The twilight zone has less light, colder temperatures, and a limited food supply, which limits the number and types of organisms that can survive there. Some examples of organisms in this zone include vampire squid, hatchetfish, and lanternfish. The midnight zone, which is the deepest and coldest zone, has no light and limited food, which means only specialized organisms can survive there. Some examples of organisms in this zone include anglerfish, copepods, and amphipods.