Its c, her father is nearsighted and wears concave lenses to correct it.
Answer:
<em>B. Methyl yellow, which changes from yellow to red around a pH of
</em>
<em>4.0</em>
Explanation:
A pH indicator is a technique by which the pH of a solution can be known. The scenario in the question describes that the scientist wants to determine a pH after it gets converted from 6 to below 4. For this recognition, the scientist should use a methyl yellow indicator which will change from yellow to red once a pH around 4 is achieved.
More co2 gas would be found in earth’s atmosphere.Because of less oxygen produced by plants
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the answer would have to be Democritus
