Do snails have an incomplete or complete digestive tract?

Do snails have an incomplete or complete digestive tract?
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They have complete digestive system.
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What is the difference between a complete digestive system and an incomplete digestive system? How are these types of digestive tubes associated or not to extracellular digestion?

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The seeds of certain plants fail to germinate if they do not pass through the digestive tract of fruit-eating birds. This is due to - (1) hibernation (2) seed coat impermeability (3) infertility (4) vegetative reproduction

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Which one of the following in birds, indicates their reptilian ancestry? (a) Two special chambers crop and gizzard in their digestive tract (b) Eggs with a calcareous shell (c) Scales on their hind limbs (d) Four-chambered heart

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