Fill in the table “Comparative characteristics of fish classes” (Cartilaginous, Bone, Bone-cartilaginous)

Comparison criteria Fish classes
Cartilaginous Bone Bone-cartilaginous
Body shape Torpedo (sharks) or flattened (rays) Fusiform, elongated or flattened Torpedo
Skeleton Cartilaginous (no gill covers) Bony (gill covers available) The skull is bony, there are gill covers, the notochord is preserved throughout life, the rest of the skeleton is cartilaginous
Respiratory system Gills Gills (lungs formed from the swim bladder in lungs) Gills
Lifestyle Active predators (sharks); bottom predators (rays) Herbivores, predators Predators (mostly benthic)
Coloration Dark above, light below Varied, depending on lifestyle and habitat (sometimes very bright) Dark above, light below
Scales Plakoid (small scales, each has a denticle directed backward) Bony (scales are located, overlapping each other, grow all life, form annual rings) Bone (large scales, form pyramidal protrusions)
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