Digestive Systems. of the. Hydra. Planaria. Earthworm. begin. Digestive Systems -overview. Before we examine each of the digestive systems lets review a flow ... www.cedarville.edu |
Cnidarians and flatworms have a gastrovascular cavity. Cnidarians, such as the hydra, use their tentacles to move food through their mouth into their ... wiki.answers.com |
Digestion in Hydra therefore can be divided into two phases, the preliminary digestion ... A circulation system is unnecessary for carrying dissolved gases and ... www.daviddarling.info |