Sponges and corals are animals why?

Sponges and corals are classified as animals because they belong to the kingdom Animalia, which is characterized by multicellular organisms that are heterotrophic, meaning they obtain their food from other organisms. Sponges lack true tissues and organs but exhibit cellular organization and can respond to environmental stimuli. Corals, on the other hand, are colonial organisms made up of polyps that have specialized structures for feeding and reproduction. Both exhibit characteristics of animals, such as movement at some life stages and forms of reproduction.