The lungs of these mammals are designed to collapse progressively with increased water pressure at depth so that air is forced out of the air sacs and into the upper part of the respiratory system.
(The lungs of these mammals; are designed; to collapse progressively with increased water pressure at depth so that air is forced out of the air sacs and into the upper part of the respiratory system) (The lungs of these mammals; to collapse progressively; ) (air; is forced; out of the air sacs and into the upper part of the respiratory system)
The lungs of these mammals The lungs of these mammals air
are designed to collapse progressively is forced
to collapse progressively with increased water pressure at depth so that air is forced out of the air sacs and into the upper part of the respiratory system
out of the air sacs and into the upper part of the respiratory system