You are presented with the question "How do beavers change waterways?" and the following answer choices: 
- They warm up the water
 - marshes, bogs, and swamps
 - They soil the water
 - Earth's axis of rotation is tilted
 - several different ways
 - They make structures that split the water
 - Genetic diversity is increased
 - By tearing down dams

Now knowing that damming a river can cause a lake to form and beavers know how to cut wood and build dams, choose the best answer.


 

      They make structures that split the water   