Why Aren't There Giant Insects

The video explores why insects today are smaller than their prehistoric counterparts. It discusses theories such as the exoskeleton's weight and oxygen delivery systems as limiting factors for insect size. Dr. John Harrison provides insights, suggesting that higher oxygen levels in the past allowed for larger insects. The video concludes that while definitive answers are lacking, oxygen levels likely played a significant role.

How do insects breathe and what is the significance of tracheals in their growth?

What role did atmospheric oxygen levels play in the size of insects in the past?