Tick the correct answer.
(i) Which one of the following does not make a substance a resource?
(ii) Which one of the following is a human-made resource?
(a) medicines to treat cancer
(b) spring water
(c) tropical forests
(iii) Complete the statement. Biotic resources are
(a) derived from living beings.
(b) made by human beings.
(c) derived from non-living things.