In the evolution of insects, _______ allowed the exchange of gases with the air, leading to the exploitation of terrestrial environments.

Question

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Tracheae are a system of tubes in the exoskeleton of insects that allow them to exchange gases directly with the air. This innovation was key to the success of insects in colonizing land. Gills are adapted for aquatic environments, lophophores are feeding structures found in some aquatic invertebrates, chelicerae are specialized mouthparts found in arthropods such as spiders, and dorsal circulatory vessels are not directly involved in gas exchange.

In the Evolution of Insects, _______ Allowed the Exchange of Gases