You are presented with the question "How do boreal species ensure their survival?" and the following answer choices: 
- Staying put
 - population movement
 - Leaving children behind
 - Earth's magnetic field
 - Going to work
 - food and shelter
 - genetic diversity
 - looseness of dirt or compost

Now knowing that earth 's magnetic patterns are used for finding locations by animals that migrate and boreal and temperate species have generally survived by migrating, choose the best answer.


 

    Earth's magnetic field     