You are presented with the question "Migratory animals are dependent on what feature of the interior of the Earth for navigation?" and the following answer choices: 
- rotating iron core
 - sense organs
 - food and shelter
 - objects that have mass
 - shield volcanoes
 - magma pipes
 - tectonic plates
 - biodiversity

Now knowing that earth 's magnetic patterns are used for finding locations by animals that migrate and earth s rotation and iron core creates a magnetic field much like giant magnet, choose the best answer.


 

 rotating iron core        