In what way shall the pilot inform the controller about Traffic and Resolution Advisory and aviding action?

What radiotelephony signal is used in such situation?
MAYDAY signal is used in such situation.
Can you explain the difference between a distress and urgency situation?
Distress situation is very dangerous for human life on board.
Urgency situation is not dangerous for human life than a Distress situation but for pilots and controllers required to be ready to any worse situation.
Please give examples? For example a distress situation is when some parts of aircraft are seriously damaged or anybody from crew and passengers can be died.
For example an urgency situation is when aircraft is hijacked or sick passenger on board.
What is the radiotelephony signal used in urgency situations and give me some examples of such situations.
In urgency situation is used PAN PAN signal.
What transponder code shall the pilot set when he is encountering a state of emergency?
7700
Is decompression dangerous? Why?
Decompression is dangerous, due to decompression passengers or crew can lose consciousness or die, and uncontrolled aircraft can be destroyed.
How do the pilots know that decompression occurs?
There are the warning lights or oral warning for the pilots from the flight deck.
What is the most common illness among crew or passengers that can lead to an immediate landing?
Heart attack, appendicitis, child birth.
What equipment will the crew request when they have a disabled person on board?
Wheelchair or ambulift.