Explain the two body plans of cnidarians. Why do cnidarians have sting cells? What is the name of the sting cell of cnidarians known as? Define: Radial, Asymmetrical and sessile How do sponges obtain nutrients? Describe how digestion and absorption of food take places in porifera. What is mesoglea? In which phylum is it found? List the four examples of cnidarians. Explain why spongebob squarepants can't be considered a true sponge based on today's lesson.