What biological characteristics have contributed to the success of insects?

Life Science Assignment

Phylum Arthropoda

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?

Your assignment should be 250-500 words in length.