When we first meet Dory, she's just swimming around minding her own business when suddenly she bumps into Marlin and instantly offers to help him hunt down his son.
Chronic obstructive pulmonary disease (COPD) is a leading cause of death and disability internationally. Alveolar hypoxia and consequent hypoxemia increase in prevalence as disease severity increases.
Is it toxic?: Considered a simple asphyxiant, which means it displaces oxygen from the air. If there is a leak into a small-enclosed space the resulting lack of oxygen may cause symptoms of hypoxia. Incomplete combustion of natural gas (from a malfunctioning furnace) can produce carbon monoxide.