In the human body, oxygen is absorbed by the lungs and nutrients are absorbed by thesmall intestine. In a single-celled organism, this absorption directly involves thea. nucleusb. chromosomesc. cell membraned. chloroplasts

c. cell membrane

Explanation:

Cell membrane -

It is the separation between the interior parts of the cell from the outside area, it acts as a protective layer from the cell.

Cell membrane is also called plasma membrane or lipid bilayer.

This membrane is semi - permeable in nature, i. e., allows only certain substance to pass through them.

Hence, from the given information of the question, the correct term is cell membrane.