Glossary | W

Warm-blooded
body temperature is controlled internally and is maintained at a constant level; endothermic
Water column
vertical depth of water; area between the surface of the ocean and the ocean floor
Water vascular system
system of fluid-filled canals and structures that aid in locomotion and food gathering
Wetlands
biologically productive areas b ordering estuaries, salt marshes and swamps that are occasionally flooded by tidal or river
Whorl
single turn of a spiral shell of a mollusk. A body whorl is the msot recently formed turn of a spiral shell terminating in an aperture.
Wrack
any marine vegetation cast up on the shore by wave action, example, kelp