Answer: They cannot bend or move easily, they are not flexible as normal cells and they can block the blood flow.
Explanation:
Sickle cell or sickle cell disorder( SCD) is a group of red blood cell disorders that are inherited and they cannot bend or move easily in a human body.
A Normal cell is round-shaped and normal cells can move through blood vessels. they are carrying oxygen to all parts of the human body and sickle-shaped cells cannot do that. A Sickle-shaped cell can block that blood flow and it can cause many problems and diseases in the human body.  
 
        
                    
             
        
        
        
Answer:
Balance is the ability to control your body's position, whether stationary (i.e. a complex yoga pose) or while moving (e.g. skiing). Balance is a key component of fitness, along with strength, endurance, and flexibility. There are various ways to perform balance exercises.
and
Explanation:
The whole purpose of recovery in exercise is to allow your muscles to repair themselves and to engage muscles that are sore from your workout. There are also different things that you can do during the recovery stage to help move the process along and come out ready to perform better than your pre-rest stage
 
        
                    
             
        
        
        
A form of stretching that's used in sports.  I learned that in my school i'm not sure though because some school's learn it differently. ≥ω≤ Hope I helped
        
             
        
        
        
Answer:
 physical contaminants that can contaminate food are  hair, bandages, fingernails, jewelry, broken glass, metal, paint flakes, bone, body parts of pests, and pest droppings.