Bugs need to breathe too
Insects need to breathe oxygen just like we do, but they don’t have lungs to take it in, or blood to transport it around the body and deliver it to their organs. Instead, bugs breathe through tiny pores on the outside of their bodies called spiracles.
Insects don’t have skeletons like us, but they have a hard, strong exoskeleton, which means the pores have to be connected to tubes called trachea to deliver the oxygen to where it’s needed in the body. Once it enters the trachea, the oxygen can then diffuse out and be used by the insect’s organs.