Answer:
A. chromosomes
Explanation:
Chromosomes are structures found in the center (nucleus) of cells that carry long pieces of DNA. DNA is the material that contains genes and is the building block of the human body.
Chromosomes come in pairs. Normally, each cell in the human body has 23 pairs of chromosomes (46 chromosomes in all), of which half comes from the mother and half from the father.
 
        
             
        
        
        
Answer:
atoms
Explanation:
Atoms are the building blocks of elements.
 
        
                    
             
        
        
        
The table is this and its a 1/4 chance
 
        
        
        
Air pollution 
hope this helps :)