How does a polyatomic anion differ from a monatomic anion?

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Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

The ph of carrots are 5.0 how it is classified a.acidic b.basic c.indicator d.neutral

What is driving behind plate tectonics (plate movment)? a) gravity only b) inertia c) convection and gravity d) the sun theres no option for science so i picked chemistry. plz