Better senses have a positive impact on an animal 's survival, and dolphins have an additional sense called echolocation. Given these facts, what has a positive impact on an animal's survival among the following options:
- human hunting
 - echolocation
 - peachleaf willow
 - a lack of human aid
 - four limbs
 - a band aid
 - sensory neurons
 - genetic diversity


 

  echolocation       