Which microscope is often used to view metal surfaces?
a. scanning electron microscope
b. scanning tunneling microscope
c. transmission electron microscope
d. compound light microscope

The correct option is:

B. scanning tunneling microscope

Explanation:

A scanning tunneling microscope is an instrument for imaging surfaces at the atomic level. Its expansion in 1981 introduced its inventors, Gerd Binnig and Heinrich Rohrer, the Nobel Prize in Physics in 1986. The scanning tunneling microscope (STM) is a type of electron microscope that shows three-dimensional images of a sample. In the STM, the structure of a surface is considered using a graver that scans the surface at a set distance from it. A remarkably fine conducting probe is held near to the sample.

protist eukaryotes that are not plants, animals, or fungi ("misfits")

cell regulation is conducted by special proteins.