Better senses have a positive impact on an animal 's survival.
Dolphins have an additional sense called echolocation.
Echolocation has a positive impact on an animal 's survival.
What has a positive impact on an animal's survival?
A: human hunting
B: echolocation
C: peachleaf willow
D: a lack of human aid
E: four limbs
F: a band aid
G: sensory neurons
H: genetic diversity