Refer to the given flow chart and select the option which correctly identifies P, Q and R.

Answer

D

Explanation

P is shark (fish) as it breathes through gills and possesses backbone. Q is walrus (mammal) as it does not breathe through gills and body is not covered with feathers and it has backbone. R is spoonbill (bird) as it possesses backbone and body is covered with feathers and it does not breathe through gills.