Which of the following is not a natural resource?
(a) Mango tree
(b) Snake
(c) Wind
(d) Wooden house
(d)
Natural resources occur naturally within an environment that exists relatively undisturbed by a human, in a natural form.
The wooden house is not a natural resource. It is man-made.
A mango tree, snake and wind are natural resources. They are present in the environment naturally.
Hence option (b) is correct.