I believe <em><u>B.</u></em><em>)</em><em><u> The hormone cortisol suppresses the immune system and is produced when the body is under stress.</u></em><em> </em>is your answer.
The answer is signal transduction. It is also known as cell signaling. It is the transmission of molecular signals beginning from a cell's exterior to its interior. Signals got by cells must be transferred efficiently into the cell to make certain a suitable response. This step is started by the cell-surface receptors.
Tumor-suppresor genes inhibit cell division in the cell-cycle to repair DNA that is damaged or abnormal chromosomes to stop the mutation of such genes which causes pathology in the body.
I think it’s A if I’m not right I’m sorry