I think your anwser would be all of the above but you don't have it
Answer: c is the answer
Explanation: it the answer because spud waves travel without the air u hear it
It is surrounded by it's environment.
Answer:
Explanation: It depends can the electricity be produced with solar power
or wind power. If fossil fuels are only way to replace power produced by
hydroelectric power, it is not advisable not to take it off production.
Somewhere certain stairs or bypasses are done to fishes which are going upstream.