Explanation:
Teens can improve their bone health and reduce the risk of developing osteoporosis as they grow old by eating foods that are rich in calcium. Calcium is an important mineral that helps build strong, healthy bones as you age.
 
        
                    
             
        
        
        
Answer:
The immune response is how your body recognizes and defends itself against bacteria, viruses, and substances that appear foreign and harmful.
Information
The immune system protects the body from possibly harmful substances by recognizing and responding to antigens. Antigens are substances (usually proteins) on the surface of cells, viruses, fungi, or bacteria. Nonliving substances such as toxins, chemicals, drugs, and foreign particles (such as a splinter) can also be antigens. The immune system recognizes and destroys, or tries to destroy, substances that contain antigens.
Your body's cells have proteins that are antigens. These include a group of antigens called HLA antigens. Your immune system learns to see these antigens as normal and usually does not react against them.
 
        
             
        
        
        
Answer:
try to reduce life stressor
Explanation:
that was a guess btw 
 
        
             
        
        
        
The motor unit is composed of both the skeletal and muscular systems. 
        
             
        
        
        
Answer:
what exactly do you want explained? I'd love to help! but I'm a bit confused :/ could you clarify?