Final answer:
The cell membrane provides a barrier for the cell, selectively allowing substances to enter and exit, supports the cell structurally, aids in waste elimination, and carries markers for cell identification.
Step-by-step explanation:
The function of the cell membrane is multi-faceted. It acts as a barrier, defining the cell's borders and determining the nature of its interaction with its environment. The membrane's selective permeability allows it to control the entry and exit of substances, thereby maintaining the internal balance of the cell. In addition, the cell membrane provides structural support, hosts receptor proteins for cell communication, and is involved in the process of eliminating waste from the cell. It also carries markers for cell identification, which is crucial for the immune response and the development of tissues and organs.
When considering the options provided, the cell membrane's role in eliminating waste coincides with this question's context, thus making it an accurate answer.