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When using science to investigate physical phenomena, which characteristic of the event must exist?
predictable
observable
provable
readable

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taskmasters
In my opinion, the correct answer from the choices listed above would be the second option. When using science to investigate physical phenomena, the event should be observable. Hope this answers the question. Have a nice day. Feel free to ask more questions.
superman1987

The answer is:

When using science to investigate physical phenomena, observable  must exist.

The explanation:

In physics, an observable is a dynamic variable that can be measured. Examples include position and momentum. ... In quantum physics, it is an operator, or gauge, where the property of the system state can be determined by some sequence of physical operations.

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