Final answer:
The diameter of a human epithelial cell is approximately 90 micrometers (µm).
Step-by-step explanation:
Cell size can vary widely among different types of cells, and it is influenced by various factors, including the cell's function, structure, and the organism to which it belongs.
The diameter of a human epithelial cell is given as 0.09 mm. To convert this measurement to micrometers (µm), we need to multiply it by 1000 since there are 1000 micrometers in a millimeter.
So, 0.09 mm x 1000 = 90 µm.
Therefore, the diameter of the human epithelial cell is approximately 90 micrometers (µm).