An electron microscope would be used if
a sample needed to appear lighter
o a sample was too small to be seen with an optical mic
details of cell structures needed to be distinguished

(B) a sample was too small to be seen with an optical microscope

lighter or darker has nothing to do with microscope.

cell structure is easily visible with optical telescope.

Explanation:

hey, what do you need . just post the question and i may be able to you : )

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it