They are more related to the extremes of gas pressures (especially oxygen, carbon dioxide, nitrogen and helium), and they develop because of the complexity of maintaining breathing gas pressures within an acceptable range for humans.
(They; are; more related to the extremes of gas pressures) (they; develop; because of the complexity of maintaining breathing gas pressures within an acceptable range for humans)
They they
are develop
more related to the extremes of gas pressures
because of the complexity of maintaining breathing gas pressures within an acceptable range for humans