Today in class we discussed the biological zonation of the ocean. The biological zonation of the ocean is important in marine biology because it explains where and why certain marine organisms live where they do. Marine organisms that require light to conduct photosynthesis would live in the Epipelagic zone. In contrast, marine organisms such as the whale and tuna would live in the Bathypelagic zone because they need no light to survive. Finally, we also learned about plankton today. There are two types of plankton; zooplankton and phytoplankton. Both of these plankton are very useful because they produce carbon that marine organisms need to survive.