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Regarding complexity of digestive system in animals: 1. An incomplete digestive system has single opening to the outside of the body that serves as both mouth and anus. 2. A complete digestive system has two openings, mouth and anus.

( a ) Both are incorrect
( b ) 1 is incorrect but 2 is correct
( c ) 1 is correct but 2 is incorrect
( d ) Both are correct
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(D) is the right answer.

In animals: Organ systems in different groups of animals exhibit various patterns of complexities. For example, the digestive system in Platyhelminthes has only a single opening to the outside of the body that serves as both mouth and anus, and is hence called incomplete. A complete digestive system has two openings, mouth and anus.
answered Jan 3, 2014 by pady_1
 

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