GENERAL HISTOLOGY

Detailed explanation-1: -Sea sponges are one of the world’s simplest multi-cellular living organisms. Yes, sea sponges are considered animals not plants. But they grow, reproduce and survive much as plants do. They have no central nervous system, digestive system or circulatory system – and no organs!

Detailed explanation-2: -Prevailing theories suggest that sponges are early animals which produced no subsequent evolutionary line. The folks over at Scientific American note that sponges’ specialized cells differentiate them from multicellular protists, creatures which are not animals, plants, or fungus, and which form no tissues.

Detailed explanation-3: -The phylum Porifera comprises the sponges. Sponges are simple invertebrate animals that live in aquatic habitats. Although the majority of sponges are marine, some species live in freshwater lakes and streams. They are found in shallow ocean environments to depths as great as five kilometers (km).

Detailed explanation-4: -The sponge is an animal. They are the simplest of multicellular organisms. It is an Aquatic animal of Phylum-Porifera with pores called ostium. They have a canal system.