Here's a bit more detail:
* Plankton is a general term for organisms that drift in water. They are divided into two groups:
* Phytoplankton: These are plant-like plankton that make their own food through photosynthesis. Examples include algae and diatoms.
* Zooplankton: These are animal-like plankton that feed on other organisms. Examples include protozoa and rotifers.
While the term "plankton" encompasses a wide range of organisms, it's important to note that not all of them are one-celled. However, many of the most common and abundant types of plankton are single-celled organisms.
