D. a protective membrane, because they surround<span> the cell
</span>
Answer:
There are many explanations.
Explanation:
1) It is "the chemical sodium thiosulphate (formerly called hyposulphite) used as a photographic fixer."
2) another word for hypodermic
3) an attack of hypoglycemia
4) under; below
Hope this helps you! ;)
The first one, cause their trying to make it a positive way to reinforce. Which just means their trying to fix something again