Ohmmeters measure resistance. Remove the battery and attach the terminals of the Ohmmeter to the ends of the circuit, where the battery used to be attached. What is the resistance?

It is the act of measuring internal resistance.

Explanation:

It should be understood that when that action is exhibited, it is towards of measuring the internal resistance.

And it should be noted that, no matter how much or little load we attach to the battery, the voltage at the source's terminals will always stay the same.

i would say it is

carbon atoms, hydrogen, oxygen, and nitrogen.