Question

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Answer 1

hi friends

c-frog 

Respiration in frogs
Frog is an amphibian having two lives, one in water and one on land.

*Frogs are the only organisms which exhibit cutaneous, branchial and pulmonary respiration in during different stages of their life cycle.
*Adult frogs can breathe through their skin. Skin is moist and slimy helping the animal to respire through skin under water as well as on land. This is termed to be cutaneous respiration.
*Adult frogs while on land respire through lungs. Lungs are the respiratory organs which help in exchange of gases. This is termed to be pulmonary respiration.
*Tadpoles, the larval stages of frog live in water. They respire through their gills as they do not possess well developed lungs. This is termed to be branchial respiration. 

d- fish

Respiration in fishes.Fish are the aquatic vertebrates which respire through structures called as gills. This is called as branchial respiration.*Gills are present on either side of the head and are supplied by rich blood vessels.

*Fish obtain oxygen dissolved in water.
*During respiration, water enters the body through mouth, passes through gills and comes out of the operculum.
*Exchange of gases takes place in the gills of fish supplied by numerous blood vessels.
*They accept oxygen into the body and expel out carbon dioxide.

Answer 2

In insects,the tracheal tubes primarily deliver oxygen directly into the insect tissues . The respiratory system is responsible for delivering sufficient oxygen all cells of the body and for removing carbondioxide (co2)