Why lampreys have simple digestive system ?
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Answer:
They return to fresh water, relying on body fat during the long journey upstream. Then they spawn and die. Lamprey are a source of food for birds, fish and marine mammals, such as seals and sea lions. They also have been harvested by humans, including American Indians.
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Explanation:
The Petromyzon has a suctorial mouth, with a rasping apparatus. It clings to fishes and feeds on their tissues. The digestive enzymes secreted by the liver and proteolytic enzymes produced by zymogen granules in the so-called pancreatic acini help in digestion of carbohydrates and proteins.
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