Columbia subject headings:
Adaptation (Biology)
Aquatic animals--Respiration.
Respiration--Regulation.
Harvard subject headings:
Adaptation (Biology)
Aquatic animals--Respiration.
Evolution
Physiology, Comparative.
Respiration--Regulation
Princeton subject headings:
Adaptation (Biology)
Aquatic animals--Respiration.
Evolution.
Physiology, Comparative.
Respiration--Regulation.