Nemertines as possible ancestors of the vertebrates.
D000220:Adaptation, Biological; D000818:Animals; D005075:Biological Evolution; D001808:Blood Vessels / Q000033:anatomy & histology; D003238:Connective Tissue / Q000033:anatomy & histology; D004247:DNA / Q000502:physiology; D004064:Digestive System / Q000033:anatomy & histology; D004463:Ecology; D006376:Helminths / Q000033:anatomy & histology; D009132:Muscles / Q000033:anatomy & histology; D009420:Nervous System / Q000033:anatomy & histology; D010614:Pharynx / Q000033:anatomy & histology; D010902:Pituitary Gland / Q000033:anatomy & histology; D012119:Respiration; D012679:Sense Organs / Q000033:anatomy & histology; D014566:Urogenital System / Q000033:anatomy & histology; D014714:Vertebrates
D004247:DNA