Mammals and humans breathe by lungs
Insects breathe by spiracles
Fish breathe by gills
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Ritarshi Bhattacharya answered this
humans animals and birds by lungs
fishes through gills
insects by their skin and spiracles
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Shreyasi Ghosh answered this
fishes respire through gills
animals and humans respire through lungs
insects respire through skin or by spiracles
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Swati Singh answered this
1.Human being breathe through their lungs and excrete urea. 2.Fishes breaths through gills and excrete ammonia. 3.insects like earthworm breath through their skin and insects like cockroaches breath through their spiracles.