they overlap onto each other
fishes
they are arranged by the fins
scales or sometimes denticles
Correct
the fishes have scales, to help and protect them from the predators.
Placoid scales are found in cartilaginous fishes and can be dermal or mesodermal in origin whereas cycloid scales are the bony scales found in bony fishes that are always mesodermal in origin.
scales or sometimes denticles
No. they aren't scales. if they were, we would need to take them off.
No. The fishes scales are attached to and cover the fishes skin (epithelium) to protect it.
Fish, reptiles, butterflies, and moths are the only animals currently known to have scales.
Skin and perhaps in some fish scales.
All fish have a body covering of scales.