Answer:
Function. A unilateral contraction of the sternocleidomastoid muscle flexes the cervical vertebral column to the same side (lateral flexion) and rotates the head to the opposite side.
Explanation:
 
        
             
        
        
        
Answer:
the correct answer is option b, as energy follow in such condition is uni directional
 
        
                    
             
        
        
        
In my opinion the answer would be A.
        
                    
             
        
        
        
Answer:
a) This may result in severe pain in the affected part accompanied by swelling
b)If striated muscles contract rapidly for a longer duration, it can cause fatigue, muscle cramps and even loss of energy.
Explanation:
 
        
             
        
        
        
Answer:
The genetic variations that are best suited for their enviornment
Explanation:
Those that are not well suited for their environment will die off, leaving only the ones that are suited for it. This species will slowly take hold until the species has adapted and become a completely different one.