A complete digestive system has openings numbering:
ATwo
BOne
CFour
DFive
Answer & Solution
Correct answer: A. Two
1. Food enters at one end and waste leaves at the other.
2. The two openings are the mouth and the anus.
3. So a complete digestive system has two openings.
_Source: NCERT Class 11 Biology, Chapter 4, Animal Kingdom._
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