True
For the condition of no breathing and no pulse, immediately commence CPR.
The signs/symptoms are in the question itself... the person is apneic and has no pulse.
First perform an Initial Assessment. Open the airway, Check for breathing, if there is no breathing give two rescue breaths. If the rescue breaths go in and make the chest clearly rise check for a pulse. IF there is no pulse begin CPR.
The person is not breathing, there is no heartbeat or pulse.
Feel their pulse, listen for breathing, and look for their chest moving.
You would only administer CPR if the person does not have a pulse or (at a slightly lower place on the chest) if you knew/believed the person was choking. Otherwise, if the person has a pulse but is not breathing, you should administer rescue breaths.
The breathing rate and pulse rate are related proportionally. If the breathing rate increases, so does the pulse rate. The pulse rate is an indication of the breathing rate.
You should use CPR if a person is not breathing (place your ear nearly to their nose/mouth, and look, listen, feel for warmth) and has no pulse (using you pointer finger, feel along the side of the neck for a carotid pulse).
It is possible to have a pulse but no breathing as in asphyxiation, but the reverse is impossible, without a pulse you basically aren't alive, that pulse is a symbol of blood pumping through your body. Good answer above. I should add that, in some subjects, that pulse may be there but not be palpable.
In my opinion, 200 feet of altitude, either higher or lower, from the normal baseline altitude of the person, will have little to no affect on breathing or pulse.
Give rescue breaths as agonal breathing will not support life.
Check for a pulse and breathing. No pulse, no breathing, give CPR.