sea sponge
Sea sponges are marine invertebrates of the phylum Porifera. Sponges consist of thin cell walls separated by a jelly-like substance known as mesohyl, which acts as the sponge's endoskeleton. Cells move through and around the mesohyl, and change functions regularly. Sea sponges have pores and channels that allows water to flow through them in a system that acts as the sponge's digestive, respiratory, and circulatory…
