Give characteristics of petromyzon. Comment on its mode of nutrition.
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The sea lamprey has an eel-like body without paired fins.
Its mouth is jawless, round and wide or wider than the head
sharp teeth are arranged in many consecutive circular rows.
There are 7 branchial or gill-like openings behind the eye.
Sea lampreys are olive or brown-yellow on the dorsal and lateral part of the body
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petromyzon body elongated, eel like, divided into head, trunk and tail , soft skin, smooth containing unicellular mocus glands but without scales
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