Anatomy is not a strong point! Can anyone help please?
23 across - A hypothetical eurasian language proposed as the parent of altaic, indo-eurasian and other language families 9letters N*S*R*T** 5across - A small hole or opening in a bone or cartilage 8letters *E***T*A 10down - The formation of, or conversion into, cartilage 15letters ***N*R*F***T*O*