Book lungs
their skin. they also have lungs but they can respire through their skin.
Insects do not have respiratory pigments in their blood. They are able to survive with low oxygen in the blood because some can respire through pores on the skin.
the respiratory system in a baby is not well developed and they do respire through mouth too, and so they keep their mouth open.
Penguins breathe or respire in the same way that humans respire. They take air in through their nostrils where it travels to their lungs.
Fish respire in water through gas exchange in their gills.
through their skin
Through the skin.
They respire through out the day.
they breath through their nostrils.
As all living things respire, even toads do respire too. It is just the matter of the way the living things respire. Toads breathe through their skin with whats called cutaneous gas exchange. They also have lungs for when they're out and about, but when in hibernation or submerged in water, they just use their skin. (Did I answer the question?) :D
Insect respiratory system uses a system of internal tubes and sacs through which gases either diffuse or are actively pumped, delivering oxygen directly to tissues that need it via their trachea.
Jellyfish respire through their body surface.