Respiratory organs in aquatic arthropods like crayfish,prawn and molluscs like $Unio$ are

Match the animals in Column-$I$ with their respiratory surface / organs in Column-$II$ and select the correct option:

Column-$I$	Column-$II$
$A$. Newts and tadpoles	$I$. Plasma membrane
$B$. Platyhelminthes	$II$. External gills
$C$. Reptiles	$III$. Body surface
$D$. Protists	$IV$. Lungs

Which of the following are the respiratory organs of insects?

Which of the following is a respiratory organ of a scorpion?

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.

In insects,oxygen is carried to different tissues by