Interphase. Reason: interphase is the first stage of mitosis but since mitosis is the division of the nucleus prophase is actually the first stage.
Have a control. You have to have something to compare your experimental results or else your results could be random chance.
The nurse has to do as the client requested. This is because they have to observe the autonomy aspect of the ethical standard which states that the client's must be respected. Autonomy gives the patient power to make his or her own decisions concerning health care.