Biology
NULL
Medium
Question
When abdomen expands, the number of spiracles open is _____________?
A
2
B
3
C
6
D
8
✓ Official correct answer
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A
2
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B
3
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C
6
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D
8
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Explanation
When a cockroach's abdomen expands during breathing movements, the 8 abdominal spiracles open to allow air to be drawn into the tracheal system.