The biggest issues are bugs don’t have lungs and bugs don’t have a skeleton. If a bug got too big they couldn’t get oxygen into the deepest parts of themselves so even a big bug needs to be a skinny bug. The lack of a skeleton means they use their exoskeleton to hold themselves up and frankly it’s just not as efficient as bones are. Back in Ye olden dinosaur times there were larger bugs when the oxygen concentration was higher.
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