C. Is the correct answer!
        
             
        
        
        
Answer: Manipulation of the Independent Variable
Again, to manipulate an independent variable means to change its level systematically so that different groups of participants are exposed to different levels of that variable, or the same group of participants is exposed to different levels at different times.
Explanation: hopes this helps and if u need any more help just let me know and i will help u.
 
        
             
        
        
        
Well puberty for girls typically passes between the time of 10-15. They get their period around 12 years old typically. Also periods are every month.
        
                    
             
        
        
        
Parallel fascicles lie parallel to one another along the longitudinal axis of the muscle. 
So your answer is A.
        
                    
             
        
        
        
In order to develop the muscles of the body evenly, it is important for all major muscle groups to be exercised. A weight-training program that only focuses on a select few areas of the body will neglect areas that are also important. To achieve optimal physical fitness, no single area of the body can be neglected for weight training.