Class 11 Biology Animal Kingdom Phylum-Porifera

Easy

Sponges exchange $O_2$ with $CO_2$ by . . . . . . .

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A
simple diffusion over their entire body surfaces
B
moist cuticle
C
tracheal tubes
D
gills

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Class 11 Questions

Class 11

Biology Questions

Chapter

Animal Kingdom

Subtopic

Phylum-Porifera

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