Assume you're sound sleeping when the doorbell rings. You get to your feet and walk over to the door, which you open and greet your visitor. Consider the several changes that occur in your body as you awaken and respond to the doorbell. How does the three types of muscle tissue (smooth, cardiac, skeletal) helps in responding to the doorbell?

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Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.