EVERYDAY SCIENCE

Detailed explanation-1: -Porifera (Sponges) is basal metazoans characterized by a wide variety of different regenerative processes, including whole-body regeneration (WBR).

Detailed explanation-2: -Introduction to Porifera. Poriferans are commonly referred to as sponges. An early branching event in the history of animals separated the sponges from other metazoans. As one would expect based on their phylogenetic position, fossil sponges are among the oldest known animal fossils, dating from the Late Precambrian.

Detailed explanation-3: -The phylum has the following distinguishing characteristics: These are pore-bearing multicellular animals. The body has no organs. They exhibit holozoic nutrition.

Detailed explanation-4: -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.