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vertebrates

Across
Are in the class osteichyes
Are in the class agnatha
Includes whales such as "killer whales"
Jawless fish, includes; lampreys, and hagfish
An animal that consumes another
Consists of the upper part of the skull in marine mammals
Used by birds to remove excess salt from their boddies
Considered the oldest living jawed vertibrates
Form a network of jelly-filled poures
Gass-filled organ that contributes to the ability of many bony fish to control their buoyancy
Whales that don't have teeth and use filter feeding
Large, tusked, and in the class pinnipedia
The process of bouncing sound off objects to find a location
Includes all flying organisms
Includes fish with a bony skeleton
"sea cows" one of the only marine herbivores
Herbivarous mamals that inhabit swamps, marsh, estuaries, wetlands, and costal marine waters
Includes; snakes, lizards, and crocodiles
Down
Eggs remaine in the mother until they are ready to hatch
System of sensory organs in aquatic vertibrates, mainly fish
Includes toothed whales
Have external ear flaps, are pinnipeds
Smallest in the class of pinnipedia, has flippers
Includes; sharks, eels, and rays
Live birth
Sharks have these to help them control their buoyancy
Organisms that hatch out of eggs
Absorbs enegery from its surroundings
"otter cat" spend most of their time out of water