Help pls

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 the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat