Healing of fractures requires cells specialized in 
less friction animals in Class Aves bone remodeling hydrogen and oxygen upper arm muscles VOCs and NOx a lot of energy deoxyribonucleic acid
A B C D E F G H
Healing of fractures requires cells specialized in  (A) less friction (B) animals in Class Aves (C) bone remodeling (D) hydrogen and oxygen (E) upper arm muscles (F) VOCs and NOx (G) a lot of energy (H) deoxyribonucleic acid