I pretty sure it's the uterus
        
                    
             
        
        
        
Characteristics of Living Organisms: Ability to reproduce independently, ability to grow
Characteristics of Viruses: Not made of cells, have a protein coat instead of a membrane. 
Characteristics of Both: Can have a DNA genome, may mutate and evolve
Hope this helps!
 
        
             
        
        
        
Percentage of human sperm cells carry an X chromosome is C 50%
        
             
        
        
        
Answer:
excretory system  and circulatory system
Explanation:
Blood is  part of circulatory system and as it move through various organs it exchanges the gases i.e give oxygen to the cell and take carbon dioxide from them. After taking CO2, the  blood becomes impure and hence it passes through the kidney before going to the heart. Kidney is part of excretory system which removes carbon dioxide from blood and thus purifies it.