Why can rats smell almost three times more compounds than humans?

The smell of Danger.
Researchers have discovered a single compound found in high concentrations in the urine of carnivores that triggers an instinctual avoidance response in mice and rats. This is the first time that scientists have identified a chemical tag that would let rodents sense carnivores in general from a safe distance.

Carbon monoxide is the answer: )

There are no negative consequences to using nuclear energy.  false. how is the   the hydrogen bomb relies on the process of nuclear fission. true.