Why don't sponges need muscles?

What kind of beetle come from the superworm larvae? Is a bichon frise dog a vertebrate? What are the 6 invertebrate groups? How do the killer bees threaten the rain forests? Does steel bend? How do you look after silkworms? What is the name for the trapdoor on the gallows? How do you get ink off money? What are the animal members of the plankton family? What is the most recent Captain Underpants? What factor allows organisms such a planarian worms and plants to regenerate new individuals from fragments of parent organisms? Do Worms have body segments? What happens if you kill a queen ant what will the worker ants do? What is a young one housefly? Are tiger swallowtail butterflies edible? What is the function of the lacina in a grasshoppers? What do ticks live off? What are the five main features of cnidarians? What is the difference between an Athropod and a Vertabrate animal? How do the echinoderms illustrate autotomy and regeneration?