The diagram shows a thermometer used to measure temperature. Which refers to the area on the thermometer marked with the letter A?

scale
bulb
mercury strip
number line

The question was incomplete as the diagram was missing, however, the correct diagram is attached with the answer -

The correct answer is - scale

Explanation:

The thermometer used to measure temperature by comparison of the object or the parameter of the temperature to measure, with a calibrated pattern that is called scale.

A Thermometer has two scales on both left and right side: degrees Celsius on the left and degrees Fahrenheit on the right.

As given in diagram label with "A'' in a circle on the left side is The degrees of the scale.

i don't know what the picture looks like but i can take a guess and say maybe basidiomycetes?

well, i believe that the answer is 2. : 3