Actually, in the past there had been very big insects. And as you sad they have a different breathing system from us. To be honest, I find their breathing system quite more efficient compared to ours. They have directs holes to their lynfatic system, which means that they have as much as oxygen they need in every part of the body. While after a run an human being would be tired, an insect wouldn't. In my opinion, the reasons behind the difference in size has to be found somewhere else (like food availability).
RE: Potato Thoughts #1: What if insects are larger than us?
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Potato Thoughts #1: What if insects are larger than us?
Thank you for commenting @doopfenel! You are right, back then there had been very big insects but to adapt in their changing environment, through time they become smaller. What are the reasons for these adaptations can be read above. Some millions of years ago the oxygen was very abundant that is one of the reasons why insects were really big. But as time passed the oxygen becomes thinner and they need to evolve into smaller species because their respiratory system is terrible. Their spiracles are very thin so it cannot expand like the lungs.
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