Answer:
b. mainly saltwater
Step-by-step explanation:
The characteristic that is not true for rivers and streams is option b - mainly saltwater. Rivers and streams are freshwater bodies of water that flow from higher elevations to lower elevations, and eventually empty into larger bodies of water such as lakes, oceans, or other rivers. They are a vital component of the water cycle, and can vary in size from small streams to large rivers that span entire continents.