The Earth’s largest phylum is Arthropoda, including centipedes, millipedes, crustaceans, and insects

The Earth’s largest phylum is Arthropoda, including centipedes, millipedes, crustaceans, and insects. The insects have shown to be a particularly successful class within the phylum. What biological characteristics have contributed to the success of insects? In many science fiction scenarios, post-apocalyptic Earth is mainly populated with giant insects. Why don’t we see giant insects today?

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