The Nile River, The amazon river, the Yangtze River, The Mississippi river/ Missouri River, <span>The Yenisei/Angara/Selenga River</span>
Answer:
This is an example of bartering.
Explanation:
Bartering is when you trade goods or services, <em>for </em>goods or services.
<em>So, your answer is A. Bartering.</em>