Final answer:
The question deals with facts about the opossum's biology, specifically identifying incorrect statements about their natural history. The key points about opossums include their role in rodent control, their robust immune systems, and being the only marsupials in North America.
Step-by-step explanation:
The subject of the question concerns the opossum natural history, specifically identifying which statement is not true about them. Among the several misconceptions and truths, the statement related to opossums using their sharp teeth to crush bones and thereby helping in getting rid of unwanted rodents in neighborhoods stands out as a beneficial aspect of their existence. The fact that they have excellent immune systems and emit an odor for protection adds to their unique natural history. Opossums being the only marsupial in North America is also a significant and true aspect of their biology.