Answer:
Metazoa.
Explanation:
Metazoa is a division in animal kingdom that consist of animals that are multicellular, heterotrophic and lack rigid cell wall. They consist of organisms rather than protists and sponges. Their cells are differentiated to form tissues. They posses eukaryotic cells which contain membrane bound Nucleus, DNA and membrane bound organelles. They are the kingdom of animals. They include fishes, amphibians, reptiles, birds and mammals.
