Some examples of mollusks are snails, slugs, clams, oysters, scallops, mussels, octopuses, cuttlefish, nautiluses, and squids Mollusks also have a feature called a mantle, this is a thin flap that covers and protects their internal organs. They are invertebrates with soft, unsegmented bodies that often are protected by a shell. Food enters the mouth and wastes leaves through a a different opening called the anus. Roundworms are carnivores or herbivores, others are parasites.Ī big difference between cnidarians and flat worms and roundworms is roundworms have a 2 opening digestive system. Many are so small you can't see them but they are there. Roundworms live in nearly any moist environment. Everything enters and leaves from the same opening. Like Cnidarians they have one opening in their digestive system. They insert a feeding tube, pump in digestive juices, breakdown of food begins, then they suck it up. Planarians rely mainly on their sense of smell to find their food. They have 2 eye spots that act like eyes but can't see as specific as we can. But they are also predators and will attack if you are smaller that it. They are scavengers, they eat dead or decaying material. They are free-living which means they do not live in or on another organism.
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