Q: How can cells of the tobacco mosaic be seen?\nOptions:\n- (A) refraction of light\n- (B) an area swollen with pus\n- (C) by indirect light\n- (D) death and devastation\n- (E) bending light rays\n- (F) electron microscope\n- (G) deadly and devastating\n- (H) Veins and arteries.
Let's think step by step below.

User
Viruses are so small that they can be seen only with an electron microscope. Viruses include the Tobacco Mosaic Virus. Tobacco Mosaic is so small that it can only be seen with an electron microscope.
Thus, the answer is (F).
Assistant