What are two major adaptations that helped insects to survive on land?

Two major adaptations that helped insects survive on land are the development of a waterproof exoskeleton and the evolution of specialized respiratory systems. The exoskeleton, made of chitin, prevents water loss and provides structural support, allowing insects to thrive in terrestrial environments. Additionally, the adaptation of tracheal systems for gas exchange enables efficient oxygen delivery directly to tissues, facilitating survival in diverse habitats.