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Answer: Kallie should focus on the type; performing a different activity to achieve her goal (Option D)
Explanation: As Kallie is already giving a lot of time in practicing and her technique and energy output are outstanding, so her frequency, intensity and time in the FITT cycle are being completed.
The FITT cycle includes:
Frequency is the number of times she practices
Intensity denotes the level of difficulty  
Time is the duration of the session  
Type is the training activity that is being performed 
Kallie should focus on the type of activity she is performing. She should change it and see if it would make her tennis serve better.  
 
        
                    
             
        
        
        
Yes and no.
Hair loss in cancer patients is typically caused by the cancer treatment, not the disease itself.
Chemotherapy, radiation, and other treatments commonly result in differing degrees of hair loss.
As the drugs destroy cancer cells, they also harm the hair follicles, leading to hair loss.
Short answer:
No, cancer does not cause it, the treatment does.