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