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An Intiative by Sri Chaitanya
a
Lower invertebrates like sponges, coelenterates, flatworms, etc., exchange gases by simple diffusion over their entire body surface.
b
Aquatic arthropods and molluscs use network of tracheal tubes.
c
Moist cuticle is used by earthworm.
d
Aquatic amphibians and the larval stages of amphibians respire with gills, while terrestrial amphibians use lungs and moist skin.
answer is B.
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