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1. very long = fish that eat plants and need a long time to digest food 2. Spiral valve = sharks 3. short = piscivorous or carnivorous fishes 4. finger-like projections = pyloric caeca = increase in surface area in different ways= good meristic character for identifying fishes.

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1.
1. very long = fish that eat plants and need a long time to digest food
2. Spiral valve = sharks
3. short = piscivorous or carnivorous fishes
4. finger-like projections = pyloric caeca = increase in surface area in different ways= good meristic character for identifying fishes.





 
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