Explain how freshwater streams change as they flow from mountains to lakes and shores.

When fresh water reaches lakes and shores , it becomes dirty and less diverse in living organism.

Explanation:

Fresh water originating from a given source is usually cooler at upstream side. Also it has high oxygen content and fresh water fauna such as fishes. In the middle of its course, its width and species diversity increases. With further progression, sediments and dust adds to the water thereby reducing its clarity and hence the penetration of sunlight. By the time this water reaches streams and ponds, it is full of mud, sand, and other sediments.