I would say d; not entirely sure
Answer: I think the answer is cold front
Explanation:
<span>It is called the Altiplano or Bolivian Plateau.</span>
Migration is when the birds go from south to north, north to east, east to north, and south to east.
The reasons for migration is that when it is cold the births fly north to south to find somewhere warmer (Like Florida). Birds can't fly in the cold so they fly to the warmer area.
