Fact 1: Damming a river can cause a lake to form.

Fact 2: Beavers know how to cut wood and build dams.

Given the two facts above, answer the question "How do beavers change waterways?" with the following options: 
- 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


 

      They make structures that split the water   