sea sponge, an aquatic animal belonging to the phylum Porifera. Sponges are simple, multicellular animals that are sessile, meaning they attach themselves to the seabed or other surfaces. They are filter Can someone please help me id this ornamental plant in my backyard? My post was deleted from the stuffy plant ID group i believe because i used an abbreviation for my state. 20 Gallon Nursery Pot for Gardening Question of the Week: Why are sea sponges considered animals? UCL Researchers in Museums 10 Best Outdoor Planter Pots That Blend Form and Function Artera Home The 22 Safest Plants to Keep Around Pets Garden Betty