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.
<span>Infections
</span><span>viruses
</span>Bacteria
Mold
and so on.
Answer:
A
Explanation:
If you can define photosynthesis..
1930-1950 hope this helps
1. More nutritious
2. More efficient growing
for example, they can be resistant to droughts or rough winds or pesticides.