NEET BIOLOGY

Detailed explanation-1: -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-2: -Answer and Explanation: Sponges belong to phylum Porifera based on their characteristics, including that they are invertebrates, are made of cells that are not organized into true tissues and they have porous bodies through which water is able to flow. Sponges are the only members of Porifera.

Detailed explanation-3: -Calcarea, Hexactinellida, Demospongiae, and Homoscleromorpha make up the four classes of sponges; each type is classified based on the presence or composition of its spicules or spongin. Most sponges reproduce sexually; however, some can reproduce through budding and the regeneration of fragments.