For a claim about the natural world to be considered scientific, what attributes must it have? it must be consistent with only a small portion of relevant observations or data. it must be applicable to future events and occurrences. it must be based on scientific observations that can be repeated in a controlled setting. it must be open to modification if new evidence doesn't completely support it.

The correct answer is that it must be based on scientific observations that can be repeated in a controlled setting.  

This controlled setting, which replicates the real world encounters is known as scientific experiments. Experiments permit for a smaller scale world where the results can be determined with the manipulation of specific elements in the controlled setting. Experiments assists in the understanding of the natural world.  

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.