Headward, the alimentary tube extends up in front of the notochord and tasks previously mentioned the upper Section of the body wall (tongue) and in front of and under the brain to affix the epidermal depression. In the epidermal despair are formed the tooth and most of the mouth lining; https://jasperxxjps.blog-mall.com/34587683/the-smart-trick-of-health-lifespan-that-nobody-is-discussing