How many times bigger is 5000 than 50

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? )

Researchers want to use edna to look for an invasive species in the water which of the steps would be likely do last

Which of these is not a nucleotide base found in dna?