Headward, the alimentary tube extends up in front of the notochord and tasks earlier mentioned the higher A part of the body wall (tongue) and before and under the Mind to hitch the epidermal depression. From your epidermal melancholy are formed the tooth and most of the mouth lining; from https://emilianolqnia.weblogco.com/34130477/indicators-on-adaptability-living-environment-you-should-know