You are presented with the question "A better what can have a positive impact on a dog's survival?" and the following answer choices: 
- food and shelter
 - sensory neurons
 - stamina
 - haircut
 - sense of smell
 - sense of touch
 - fur pattern
 - prolactin release

Now knowing that better senses have a positive impact on an animal 's survival and dogs are social animals, but they have an acute sense of smell, choose the best answer.


 

     sense of smell    