Note that the scale bar under the photo is labeled 1 μm (micrometer). the scale bar works the same way as a scale on a map, where, for example, 1 inch equals 1 mile. in this case the bar represents a much smaller distance. what is the approximate diameter of the mature parent cell?
a. 0.25 µm
b. 4 µm
c. 40 µm
d. 4 mm