GPT-4: Scientists propose that a unique enzyme called multicopper oxidase-2 (MCO2), which helps insects harden their exoskeletons, is the reason for their rarity in marine environments but abundance on land. The enzyme uses molecular oxygen to transform insect cuticles into lightweight, durable casings, providing a protective biomaterial that allows insects to thrive in terrestrial ecosystems. This MCO2-mediated system may have significantly influenced insect evolution and success, offering insights into their adaptation to land environments.
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