Read the question, supplied answer marker, source image and current academic review note.
The source image is the exact booklet reference. The text below is a searchable transcription and may need final formatting review for formulas or symbols.
The opening between the right atrium and the right ventricle is guarded by .
Option 2 - tricuspid valve
Explanation will be updated after review.
Use the source crop for formulas, diagrams and typography that may not be fully represented in the text transcription.
Biology
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Topic review pending
Review Pending
Multiple Choice
2026
Source image verified; text transcription pending final academic review.
The earlier 2.4 MB study booklet contains the supplied questions and answer markers, but does not identify a paper code.
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Chapter review pending · Topic review pending
Option 2 - ALL BIV, CI, DI
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Option 1 - simple diffusion over their entire body surfaces
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Option 1 - 0.01
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Option 1
