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Which of the following DOES NOT describe a less developed country?
Vertebrates
A group of animals that have a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fish.
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.
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