Question

How do the organisms like amoeba, earthworm, cockroach, plants, various aquatic animals, birds respire?

Answer 1

earthworm respire through 'parapodia'
cockroach respire through 'trachea'
plants respire through 'stomata,lentilcles on branches or stem'
fishes respire through 'gills'
urochordates respire through 'gill slits'
snails respire through 'gills'
king crab respire through 'book gills' etc

Answer 2

Respiration is one of the most important biological processes in Living Organism.

Different species of living organisms have different types of respiratory system and organs.

The respiratory organs of following species are:

Amoeba: Moist skin

Earthworm and Cockroach : Spiracles

Plants: Stomata

Aquatic animals: Gills

Birds:Lungs

With the help of these organs these species perform respiration.