Ocean mammals' lungs are designed to collapse progressively with increased pressure, forcing oxygen from the alveoli, or air sacs in their lungs, and into the upper part of their respiratory system.
(Ocean mammals' lungs; are designed; to collapse progressively with increased pressure) (Ocean mammals' lungs; to collapse progressively; ) (Ocean mammals' lungs; forcing; oxygen from the alveoli, or air sacs in their lungs)
Ocean mammals' lungs Ocean mammals' lungs Ocean mammals' lungs
are designed to collapse progressively forcing
to collapse progressively with increased pressure
oxygen from the alveoli, or air sacs in their lungs