Explain how acid–base indicators can be used to determine the approximate ph of a substance.

PH stands for potential hydrogen.
pH can be accurately tested using acid-based indicators since it is a part of the pH of something itself. (acid and bases) The indicators themselves work when the acidic properties of the indicator begins to dissolve and form ions which gives the color indicating the pH.

Organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.

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