If beavers can create lakes, then how do beavers change waterways?

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

 

      They make structures that split the water    