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

It must be based on scientific observations that can be repeated in a controlled setting

Explanation:

This controlled setting that replicates the real world experiences is called scientific experiments. Experiments allow for a smaller scale world where outcomes can be predicted with the manipulation of particular factors in the controlled setting. Experiment help in the understanding of the natural world

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~jea

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.