Question: You are presented with the question "Hydropower requires beavers damming what?" and the following answer choices: - lakes with large rocks - a hydraulic system - organisms and their habitat - streams with two branches - water with old boards - scarce resources - fissures of hot, acidic water - streams with fallen trees Now knowing that hydropower requires damming a river and streams and rivers are crossed on rocks, beaver dams, on fallen trees or by wading, choose the best answer.
Answer:
streams with fallen trees