Question: what is the difference between phytoplankton and zooplankton why are they both plankton?
Answer: Phytoplankton depends on sunlight for making their food, they primarily live on the surface of the water, while zooplankton lives in the darker and colder area of the water body. Being in the category of plants, Phytoplankton releases oxygen into the atmosphere, whereas zooplankton does not have such function.