Lung Adaptation

Alex Woolsly is able to breath comfortably underwater, while Claire is not.

Lung Adaptation is is the biological ability of a DNA Alternate to improve their respiratory system to process any gas or liquid for oxygen. The Alternate could breathe underwater, or in a room filled with smoke, or other usually poisonous gases. The lungs need some exposure to adapt, anywhere from a single breath to several, and the adaptation may only last a short time.

The Alternate could potentially exhale breathable air, allowing them to act as a respirator for someone else underwater.