Which organ/structure is used by the first terrestrially successful or – InterviewSolution

1.	Which organ/structure is used by the first terrestrially successful organism for exchange of gases 1)gills 2)buccal cavity 3)moist skin 4)lungs
Answer» Which organ/structure is used by the first terrestrially successful organism for exchange of gases 1)gills 2)buccal cavity 3)moist skin 4)lungs

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