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21.	Internal fertilization takes place in
	A. frogs B. rabbits C. fishes D. calotus

22.	The study of fresh water habitat is called
	A. ecology B. estuary C. limnology D. oceanography

23.	Which one of the following is a biotic component?
	A. plants B. light C. water D. temperature

24.	Bees are particularly sensitive to
	A. red colour B. ultraviolet light C. green colour D. no colour

25.	AIDS is caused by
	A. bacteria B. protozoa C. virus D. helminth

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