Columbia subject headings:
Biological transport.
Vertebrates--Cytology.
Harvard subject headings:
Princeton subject headings:
Aquatic animals--Adaptation.
Aquatic animals--Ecophysiology.
Aquatic animals--Evolution.
Aquatic animals--Habitat.
Aquatic biology.
Aquatic habitats.
Habitat (Ecology)--Modification.
Vertebrates--Adaptation.
Vertebrates--Ecophysiology.
Vertebrates--Evolution.
Vertebrates--Habitat.