title: Slowly the tortoise got its shell.
mesh_terms: D060105:Animal Shells / Q000033:anatomy & histology / Q000502:physiology*; D000818:Animals; D005075:Biological Evolution; D015656:Respiratory Mechanics / Q000502:physiology*; D012132:Respiratory Muscles / Q000033:anatomy & histology / Q000502:physiology; D012272:Ribs / Q000033:anatomy & histology / Q000502:physiology; D014426:Turtles / Q000033:anatomy & histology / Q000502:physiology*