||All members of the phylum Chordata.
||A flexible rod that supports a chordate's back.
||Many little bones that make up the backbone.
||Animal whose body does not produce much internal heat.
||Animal whose body controls how much internal heat it produces.
||A vertebrate that lives in water and uses fins to move.
||A tissue that is more flexible than a bone.
||An internal gas filled sac that helps the fish stay stable at different depths in the water.