In Japan, the presence of ducks and the aquatic fern Azolla in rice cultivation has shown that ________

A) invasive species diminish rice yields
B) ducks and other birds must be eliminated from rice fields
C) the ferns provide an excellent food for ducks
D) GM crops such as rice cannot succeed without ferns to provide shade and ducks to provide pollination
E) restoring portions of the biodiversity of a natural ecosystem increases crop yields and profits


E

Environmental & Atmospheric Sciences

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