Because they become older
I'm guessing g the term you are looking for is volcanic winter. It's when volcanic ash and sulfuric acid droplets block out the sun after a large volcanic explosion. I would suggest a quick google search to figure out if this word is the right word you are looking for.
The mitochondria converts energy stored in food to energy the cell can use to live and function.
<span>ribosome (protein synthesis)
2. endoplasmic reticulum (protein modification
. Golgi apparatus (protein packaging)
So the answer is B</span>
The optical fibers,we studied that in chemistry