The answer would be nodding.
 First class lever refer to a lever on which the resistance exist in one one side of the fulcrum and an effort is made on the other side you can't get a reaction unless something else causes a reaction. 
 
        
             
        
        
        
Answer:
The symptoms involved in ontogenesis imperfect are- bone breakage, pain in bone, deformation of bones, brittle teeth, coloured tint in the white portion of eyes, loss in hearing and loose joints.
Explanation:
In the disease, ontogenesis imperfect, the strong bone formation in body is prevented by the defective gene that produces collagen protein. People who have the deficiency of collagen by birth, can develop this disease or can have it by birth. This defect can be hereditary. 
The symptoms included in this disease are the- deformation and breakage of bones, pain in bone, grey or purple tint in the white portion of the eye, short stature, brittle teeth, hearing impairment and loose joints.
 
        
             
        
        
        
The answer is Muscle endurance
        
             
        
        
        
I would say for because everything else is important <span />
        
                    
             
        
        
        
Answer:
are you are tagalog amp sorry i don't anther stand