Millions of nonnative cattle in australia produce a huge amount of dung. for decades, australia has imported nonnative dung beetles to clean up the dung. which sentence best explains why australia would introduce nonnative species of dung beetle into their country? a. no decomposers exist in australia because they have no niche. b. native australian dung beetles lack a niche in australia. c. cows have no known niche in australia. d. cow dung is not part of any native australian species' niche

Correct D). Cow dung is not part of any native Australian species' niche

The beetles in Australia had formed along with the kangaroos and wombats. When the cattle are brought to Australia in the 1880. The beetles were not used to the texture of dung. It was quite different and the dung was not decomposing. Native beetles were not using this type of dung as a feeding source. Because of this cattle were not able to feed the pasture because they were not be able to eat near the dung.    

Hence, the correct answer would be option D.

a and c are the answeres