Pedro is planning to model how changes in weather affect evaporation from lakes. For his first experiment, he wants to test how humidity affects the
evaporation rate. He places one beaker with 300 mL of water in a dry area,
and he places another beaker with 300 mL of water near a humidifier.
Which of the following variables does Pedro need to control during his
experiment?
O A. Volume of water only
B. Volume of water and temperature
C. Humidity and evaporation rate
D. Humidity only

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Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.