Why does the locking mechanism of the knee help explain why…

Why does the locking mechanism of the knee help explain why dancers find it easier to turn out during plié versus when the knees are straight? a. the locking mechanism of the knee causes the femur to externally rotate on the tibia during the end ranges of knee extension during standing b. the locking mechanism of the knee causes the femur to internally rotate on the tibia during the end ranges of knee extension during standing c. the locking mechanism of the knee causes the tibia to internally rotate on the femur during the end ranges of knee extension during standing  

BRIEFLY DISCUSS WHY PHARMACEUTICAL MANAGEMENT OF DISORDERS B…

BRIEFLY DISCUSS WHY PHARMACEUTICAL MANAGEMENT OF DISORDERS BY MANIPULATING SEROTONIN LEVELS CAN CAUSE SERIOUS OR PROBLEMATIC SIDE EFFECTS AS A RESULT OF TOO MUCH OR TOO LITTLE SEROTONIN. NEED AT LEAST ONE ISSUE FOR TOO MUCH AND ONE FOR TOO LITTLE. NO NEED TO OVERDO HERE!