4. 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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Animals with an digestive
system are in which the
tube has only opening (cnidarians,
platyhelminthes). with a
complete system are those
which the digestive has two
openings, and anus (all
animalphyla, with the of
poriferans, that not have any
tube).

In animals incomplete digestive
tubes digestion is mixed, begins in
the space and finishes
the intracellular space. animals with
complete systems extracellular
digestion the digestive tube
.