We are aware that our earth is indited by various kinds of living organisms. These organisma live in different habitats and are adapted to those conditions. As a result , different organisms have developed different mechanisms for breathing . let us study about a few of them

AMOEBA

Amoeba is a single-celled organism which lives in fresh water . it takes in oxygen present in the water and gives dioxide through its plasma membrane by diffusion

EARTH WORM

Earthworms live in the moist soil . They breathe by simple diffusion through their skin . They do not have any special respiratory  organs as their skin is very thin , moist and permeable to gases

INSECTS

They do not have lungs and their blood is not capable of carrying oxygen. Insects have a system of tubes, called tracheae .

FISHES

Fishes breathe through gills present on the body .