What is the characteristic feature of phylum Porifera?

Phylum Porifera, commonly known as sponges, is characterized by the presence of numerous pores or openings in their body structure, which allows water to flow through them. This unique feature is essential for their feeding, as sponges filter small particles from the water. Additionally, sponges are simple animals that generally lack a true body structure, such as bones or tissues, which differentiates them from other more complex animal phyla. Their cellular organization allows them to perform basic life functions without specialized organs or nervous systems. This characteristic of having a porous body and lacking a bony structure is pivotal in defining phylum Porifera, making option B the correct choice.