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 sun rays are received by the plants and explell oxygen and we breath the oxygen to be able to survive
It can be caused by the humid air or surrounding.
Humid air makes the stones absorb water and therfore makes it soft.
The cell membrane gateway system you are looking for is called <span>Sodium Potassium Pump.</span>
An observation : something you observe with your 5 senses
inference : the conclusion based on evidence and observations