What is the preparation phase of mitosis called?

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? )

Which type of stimulus do mechanoreceptors detect? sound pain heat light

How does the color of light affect the germination time (amount time a plant takes to develop) of a radish seed?