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Answer: cell membrane
Explanation: The cell membrane is the structure around the cell. It controls what is inside the cell and what is outside the cell by acting like a barrier. The answer to the question is cell membrane. Hope this helps you!
The cell membrane is responsible for controlling the passage of water, nutrients and waste products into and out of the cell. So, the correct option is A.
What is the cell membrane?
The cell membrane is also called the plasma membrane. Unlike the cell wall, the cell membrane is present in all living organisms. The cell membrane is made up of a lipid bilayer and is selectively permeable in nature.
The selectively permeable nature of the material ensures that only the selected or required substances pass through the cell membrane. Therefore, the cell membrane is able to regulate the transport of water, minerals and other substances into and out of the cell.
Other than lipids, the cell membrane also has different types of proteins as its component. They are either structural proteins or help in transportation.
The lipid part of the cell also contains a high percentage of cholesterol. The cell membrane also provides structural support to the cell and protects it by preventing the entry of toxic substances and exit of required substances from the cell.
Therefore, the correct option is A.
Read more about cell membranes, here https://brainly.com/question/12476894
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