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Insects did not evolve from an aquatic ancestor except in the same sense that we evolved from something fishlike. Their ancestors were terrestrial arthropods. The point about convergent evolution is interesting but not especially surprising. Both insects and crabs have compound eyes with similar architecture, for example, although no one thinks that's a matter of convergent evolution, but rather of distant relatedness. More to the point, both have antennae studded with chemoreceptors- all that remained to be done was selection for sensitivity to volatile gasses and other chemicals encountered in its new environment. Cool, but not earthshaking.
Finally, and I offer this as someone with a Ph.D. in entomology, insects do not have noses. They have olfactory receptors on various parts of their bodies, including their antennae, but let me repeat, in my best professorial tone, insects do not have noses.
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