Which statement best describes a negative effect of human activity on Africa’s waterways?

O The use of river transportation has harmed water quality.

Explanation:

The rest of the options have effects that would have happened on their own over time anyways. Some of them Ern't much of our fault in fact. River transportation has had a dramatic impact though, and it is something humans are Indeed responsible for

can you show the map

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.