Well all living organisms require oxygen to survive, and all bodies of water on this planet are usually heavily oxygenated, which im guessing is where the underwater plants get all their nutrients from. hope this helps!
Answer:
The best policy, they claimed, was for the United States to build up its own defenses and avoid antagonizing either side. Neutrality, combined with the power of the US military and the protection of the Atlantic and Pacific Oceans, would keep Americans safe while the Europeans sorted out their own problems.
West Germany had economic aid provided by the United States and the Marshall Plan. The currency reform (1948) replaced the Reichsmark with the Deutsche Mark.