I think it is the cell membrane, but there is a possibility it is the cell wall. I think the cell membrane is correct because the skin does allow certain things into your skin cells, such as water. Similarly, cell membranes allow certain things in the cell. The cell membrane basically acts as the security guard of the cell.
The answer should be something like this:
how best to allocate scarce resources among competing uses.
An independent regulatory agency is part of the executive branch. The answer to your question is C. I hope that this is the answer that you were looking for and it has helped you.
