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Question

Atrial and branchial apertures of Herdmania are surrounded by:

A
Two lips
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B
Three lips
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C
Four lips
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D
Five lips
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Solution

The correct option is C Four lips
The atrial and brachial siphons are the protuberances on which atrial and brachial apertures are situated. Both of them are surrounded by four lips each.
So, the correct answer is ' four Lips'.

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