Different types of respiratory organs like gills,book gills,book lungs and trachea are present in

Skin of man cannot act as a respiratory organ because

In which of the following is the skin an accessory respiratory organ?

The diaphragm is absent in which of the following?

Among vertebrates,...$A$... use gills whereas reptiles,birds and mammals respire through the ...$B$... Amphibians like frogs can respire through ...$C$... also. Mammals have a well adapted respiratory system. Select appropriate choice for the blanks $A, B$ and $C$ to complete the given $NCERT$ statement.

Assertion : Blood is coloured in the insects.
Reason : Insect blood has no role in $O_2$ transport.