Dilation occurs when part of a cell that a what does not have relaxes.
breathing organ the eyes abrasion complex animal nerves retina
A B C D E F G H
Animals have no cell walls.
Dilation occurs when part of a cell that an animal does not have relaxes.
Dilation occurs when part of a cell that a what does not have relaxes. (A) breathing (B) organ (C) the eyes (D) abrasion (E) complex (F) animal (G) nerves (H) retina