This question is way too broad in range. What does the car do, sounds, possible smells, or anything that the car usually doesn't do except not start.
Certainly, a loose wire on the car battery can cause the car not to start.
Yes, one bad cell in a car battery will cause the car not to start.
your car should still start, regardless of the alarm It depends on the alarm, some can cause a no start.
cause it has no fuel.
Probably not, although it could lead to other problems which would cause your car not to start.
Not usually. But it will cause it to overheat. What kind of car?
No. A bad starter would cause the car not to start.
Weak battery and no gas can both cause a no start.Weak battery and no gas can both cause a no start.
A damaged fuel pressure regulator can cause a car not to start.
engine
a bad engine
yes