Electric generating plants transport large amounts of hot water through metal pipes, and oxygen dissolved in the water can cause a major corrosion problem. hydrazine (n2h4) added to the water avoids the problem by reacting with the oxygen:

Aneuron is stimulated with an electric pulse. the action potential is detected at a point 3.70 cm down the axon 0.0052 s later.when the action potential is detected 7.20 cm from the point of stimulation, the time required is 0.0063 s. what is the speed of the electric pulse along the axon? (why are two measurements needed instead of only one? )

What are some possible short and long term medical concerns for crew members on longer space exploration trips

Are the earth's ocean floor and continents the same age geologically? why or why not?