When homing salmon navigate up a river, they
A) are influenced as much by habitat quality as by the odor of their birthplace.
B) usually choose correctly at a fork in a stream, but if they choose the wrong branch they are ultimately unable to find their way home.
C) will fail to reach their birthplace if their nasal cavities are plugged.
D) will fail to reach their birthplace if they are blinded.

Question

Quizplus · Accepted Answer

Salmon rely heavily on their sense of smell to navigate back to their birthplace to spawn. Plugging their nasal cavities impairs this crucial sense, making it difficult or impossible for them to find their way home.

When Homing Salmon Navigate Up a River, They