Scientists often investigate alternative explanations for the data and observations presented, even once a hypothesis has been tested and supported through an experiment. this investigation of alternative explanations

Strengthens the evidence and support for a scientific theory.

Explanation:

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Scientific method provides a compelling tool scientists use to both develop and demonstrate new theories. As it involves both the observation and experimentation towards a specific subject of matter, it turns out convenient to consider alternative explanations substantiating such subject of matter in light of obtaining a more precise explanation for it. In such a way, this investigation of alternative explanations strengthens the evidence and support for a scientific theory.

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the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be