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- Vasculated
- having numerous blood vessels
- Velum
- shelf or rim that projects inward around the margin of the bell of a hydozoan, partially closing the opening
- Venom
- a toxin injected into a victim
- Ventral
- toward the lower side or belly; underside; opposite of the dorsal side
- Vertebrate
- animal with a backbone: having a dorsal column of vertebrae
- Vertical migration
- periodic movement of an animal up and down the ocean's water column
- Vertical zonation
- distinct banding of groups, populations or organisms at different levels of a habitat
- Vestigial
- usually a non-functioning remnant of a body part that once existed as a fully functioning part of an organism
- Vibrissa
- whisker(s) of mammals, plural: vibrissae
- Viviparous
- producing living young that develop from eggs retained within the mother's body, receiving nourishment through the placenta
- 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.
- Wild salmon
- salmon that have spent their entire life cycle in the wild and originating from parents that were also produced by natural spawning and continuously lived in the wild
- Wrack
- any marine vegetation cast up on the shore by wave action, example, kelp
- Zero tide
- average of the lower low tides
- Zonation
- distribution of the plants and animals in a community into recognizable, distinctive zones
- Zooanthellae
- photosynthetic microorganisms that live symbiotically in the tissues of organisms such as corals and jellies
- Zooplankton
- planktonic animals suspended in the water column
- Zygote
- fertilized egg