What is the meaning of metazoan?

Metazoan refers to a group of multicellular organisms that are composed of differentiated cells and organized into tissues and organs. This term is used to distinguish these organisms from single-celled organisms such as bacteria and protists. Metazoans include animals such as insects, fish, birds, and mammals.

Metazoans are multicellular, eukaryotic organisms that belong to the kingdom Animalia. The term "metazoan" is derived from the Greek words "meta" (meaning "after") and "zoon" (meaning "animal"), and it refers to the fact that metazoans are more complex than other types of animals, such as protozoans, which are single-celled. Metazoans possess specialized tissues and organs that perform specific functions, and they often exhibit complex behaviors and interactions with their environment. They include a wide range of organisms, from insects and worms to fish, amphibians, reptiles, birds, and mammals.