What type of organisms are zooplankton?

Zooplankton are classified as drifting animals in aquatic ecosystems. These organisms are a crucial part of the aquatic food web, serving as a primary food source for larger animals such as fish and whales. Zooplankton include various species, ranging from microscopic protozoa to larger crustaceans. Their ability to drift along with water currents makes them an essential component of both freshwater and marine environments, as they feed on phytoplankton and contribute to nutrient cycling in the water.

In contrast, producers in aquatic ecosystems, like phytoplankton and algae, are responsible for converting sunlight into energy through photosynthesis. Man-made entities do not fit the biological classification of organisms, and bottom-dwelling plants refer to organisms that are rooted on the substrate of aquatic environments, contrasting with the free-floating nature of zooplankton. Thus, the classification of zooplankton as drifting animals highlights their vital role in the ecosystem and their unique characteristics.