👉 Metazoans are a group of eukaryotic organisms that include all animals, plants, and fungi. They are characterized by their cell walls made of cellulose or chitin, which allows them to form tough, flexible structures called keratin fibers. Metazoan cells also have specialized organelles such as mitochondria, ribosomes, and endoplasmic reticulum for metabolic processes. Metazoans have a wide range of adaptations that allow them to survive in various environments: