Notochord, Chordates are primarily characterized by having a ____, Mormyrid, Have a relative brain size comparable to humans., megamouth shark, Has a brain of only 0.002 percent of its body weight., Leydig’s organ, Produced in an organ that is only found in cartilaginous fishes., placoid scales, It is also called as a dermal denticles.dermal denticles .

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