Examlex
Leisure is increasingly dominated by ________, "the 800-pound gorilla of leisure time."
Placoid Scales
The toothlike scales found in sharks and other cartilaginous fishes.
Cartilaginous Fishes
A class of fishes that have skeletons made entirely out of cartilage, rather than bone.
Jawless Fishes
A group of fish that lack a true jaw, represented by modern lampreys and hagfishes, belonging to the superclass Agnatha.
Myxini
A class of jawless marine animals known as hagfishes, characterized by their slimy skin and primitive features.
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