When the dry-bulb reading of a thermometer is 20ºC and the wet-bulb reading is 11ºC, the relative humidity is approximately a.17
b.30
c.33
d.55

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The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature