Read the question, supplied answer marker, source image and current academic review note.
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Sponges exchange O, with CO, by .
Option 1 - simple diffusion over their entire body surfaces
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
Chapter review pending
Topic review pending
Review Pending
Multiple Choice
2026
Source image verified; text transcription pending final academic review.
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Chapter review pending · Topic review pending
Option 2 - tricuspid valve
Chapter review pending · Topic review pending
Option 1
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Option 2 - ALL BIV, CI, DI
Chapter review pending · Topic review pending
Option 1 - acetyl choline
