In Japan, the presence of ducks and the aquatic fern Azolla in rice cultivation has shown that ________
A) ducks and other birds must be eliminated from rice fields
B) invasive species diminish rice yields
C) restoring portions of the biodiversity of a natural ecosystem can increase crop yields and profits
D) the ferns provide an excellent food for ducks
E) GM crops such as rice cannot succeed without ferns to provide shade and ducks to provide pollination
Answer: C
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