What features of the earth's magnetic field might provide an animal with positional information for a magnetic "map"?
A) declination, which varies in a regular pattern.
B) the angle of inclination, which varies predictably with latitude.
C) the intensity of the total magnetic field, if it can be detected.
D) Any of these might be used.

Question

Quizplus · Accepted Answer

Each of the features mentioned (declination, angle of inclination, and intensity of the total magnetic field) varies in a predictable manner across the Earth's surface, providing potential cues for navigation and positioning that animals could exploit to form a magnetic "map."

What Features of the Earth's Magnetic Field Might Provide an Animal