B decreased attention span
        
             
        
        
        
Answer:
About 10% to 15% of adult colds are caused by viruses also responsible for other, more severe respiratory illnesses.
B 
Explanation:
 
        
                    
             
        
        
        
Girls: in between 8 and 13
Boys: in between 9 and 14
It doesn’t specify what gender I’d go with answer B
        
             
        
        
        
Lol funny question.
But to answer it, yes in order to stop a piece of paper from folding or creasing you put it in a folder, or maybe a binder. You can even lay this piece of paper on a table that won’t be touched/untouched. So therefore it will stay flat and not have any creases or bends or folds. Also a folder keeps the paper clean from getting messy
        
             
        
        
        
Answer: The nervous system
Explanation:
The first part of the embryo to develop is the neural tube, which will become the spinal cord and brain. As the nervous system starts to develop, the tiny heart starts to pump blood, and other parts of the body—such as the digestive tract and backbone—begin to emerge.