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Chondrichthyes

Across
___ are equipped with a stinging spine.
The triangular ___ fin atop the shark helps it with balance.
Devil rays have ___ fins, which give them the appearance of having devil horns.
This class is known to have a ___ diet.
Most skates release their eggs in a leathery rectangular egg case called a ___ ___ . (two words)
__ is a subclass of Chondrichthyes.
Development is usually live birth (ovoviviparous species) but can also be through eggs, which is known as ___.
They do not contain lungs or a ___ ___ . (two words)
On both of the skates and rays, the ___ fins are flat and expanded.
If a shark stops swimming, the water containing oxygen would not flow over its ___ .
Down
Sawfish swing their blade through ___ of fish in order to disable/kill them for food.
This animal's upper jaw is not attached to its skull unlike most animals.
___ work together as top predators to keep a stable environment.
___ are commonly called ghost sharks and ratfish.
The special scales that cover these animals skin are called ___ scales.
What is the skeleton made up of?
Rays give birth to ___ ___ . (two words)
Sharks move their ___ fins side to side to propel themselves forward.