I'll try to explain, because I've had tubes before.  In fact, I still have them.
For me, tubes were put in because of too many ear infections, and excessive water in my ear.  The tube helped drain the water out.  You can see A picture I have in a file.  The tubes can be put I believe in the ear drum.  They're put there to help drain water that has trouble getting out on its own.
 
        
        
        
The inside of a stomach is coated with a lining that protects it. 
This lining is made up of cells called epithelial cells. They coat the stomach with a mucus that neutralizes the acid.
The mucus contains bi-carbonate (a base), similar to baking soda. 
Acid + Base = water and salt 
So, that’s why taking tums or swallowing baking soda water helps an upset stomach. 
When your stomach is upset, it means there’s too much acid. Taking a tums neutralizes that overproduction eating also helps to absorb the excess acid.
        
             
        
        
        
The correct answers are no movement; extensive movement.
You cannot move the joints near your skull - at least now willingly - only a doctor can remove parts of your skull if you are undergoing a brain surgery. Otherwise, there is no movement at all there. However, when it comes to your shoulders, for example, you can move them at will in whichever way you want to.
        
             
        
        
        
Answer:
AIDS
Explanation:
AIDS is the most common infectious disease causing lymphocytopenia, which arises from destruction of CD4+ T cells infected with HIV.
 
        
             
        
        
        
The term drug overdose<span> (or simply </span>overdose<span> or </span>OD<span>) describes the </span>ingestion<span> or application of a </span>drug<span> or other substance in quantities greater than are recommended </span>or generally practiced.[2]<span> An overdose may result in a </span>toxic state<span> or </span>death. <span>The word "overdose" implies that there is a common safe dosage and usage for the drug; therefore, the term is commonly only applied to drugs, not </span>poisons<span>, though even poisons are harmless at a low enough dosage.</span>