For a scientific theory to be valid, in what way should it be verified?

For a scientific theory to be valid, in what way should it be verified?

Correct Answer: experimentally
systematically
directly
optimally

Explanation: For a scientific theory to be valid, it must be verified experimentally. Many parts of the string theory are currently untestable due to the large amount of energy that would be needed to carry out the necessary experiments as well as the high cost of conducting these experiments. Therefore string theory may not be tested in the foreseeable future. Some scientists have even questioned whether it deserves to be called a scientific theory because it is not falsifiable.

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