What Type of Signal is Long-Lasting and Works at Night

Question

What type of signal is long-lasting and works at night?
A) olfactory
B) visual
C) auditory
D) tactile
E) electrical

Accepted Answer

Olfactory signals, or signals based on smell, can last for long periods of time and can still be detected at night. For example, a particular scent may linger in an area for hours or even days, and animals may use this to navigate their surroundings or communicate with each other. Visual, auditory, tactile, and electrical signals may not persist as long or may not be as effective in low light conditions.