David observes human epithelial cells under a microscope. He uses the ×40 objective lens and measures the diameter of a cell at 8 O. U. Using the same calibration table
above, calculate the diameter measurement to um?

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.

the answer is definitely a

it is a. i hope this .