Question

Humans breathe through bronchi. What structure do insects have for breathing? A. gills B. tracheae C. skin D. lungs

Answer 1

Instead of lungs, insects breathe with a network of tiny tubes called tracheae. Air enters the tubes through a row of holes along an insect's abdomen. The air then diffuses down the blind-ended tracheae. Since the biggest bugs have the longest tracheae, they should need the most oxygen to be able to breathe.
B. tracheae

Answer 2

Insects breathe through their tracheae. Thus, the answer to the question above is letter B. Tracheae is a network of fine tubes. The air enters the insect's body through a row of holes in its abdomen. This air diffuses through to the blind - end tracheae.