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Animal kingdom

Grouping of all living beings with more or less complex organs, with which they move about and feed themselves; the body of knowledge about them.
fishes

FISHES

Cold-blooded aquatic vertebrates (about 30,000 species) having motor fins and bodies that are usually covered in scales.

cartilaginous fish

cartilaginous fish

Fish whose skeleton is made of cartilage rather than bone; its skin is covered in hard scales called denticles. There are currently 700 species.

bony fish

bony fish

Fish with a rigid skeleton and smooth flat scales; the 20,000 present-day species make up the largest group of fish.