Answer:
Its D, The cell membrane(also known a the plasma membrane) has a job in which it has to allow passage in and out of the cell. Therefore it can prevent harmful substances from entering the cell. Think of it as security, either allowing you access or denying you depending on if you're a threat
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When your body temp gets too low you begin to shiver. Brining your body temp to a comfortable level will cause it to stop shivering.
