Difference between placoid and cycloid scales

1.	Difference between placoid and cycloid scales
Answer» \tPlacoid scalesCycloid scalesThey are hard and toughThey are comparatively flexibleThey are mainly present in cartilaginous fishesThey are mainly present in body fishesThey have rough posterior margins and give rough appearance to the skin of fishesThey have smooth posterior margins and give smooth appearance to skin of fishes\xa0\t\xa0

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