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Tick the correct answer.
(i) Which is not a natural ecosystem?
(a) Desert
(b) Aquarium
(c) Forest
(ii) Which is not a component of human environment?
(a) Land
(b) Religion
(c) Community
(iii) Which is a human-made environment?
(a) Mountain
(b) Sea
(c) Road
(iv) Which is a threat to environment?
(a) Growing plant
(b) Growing population
(c) Growing crops
