Can every be a subject in a sentence

What is chemistry and it applications

Which sentence is punctuated correctly?  a.under a microscope; the organisms look a bit like ruffled tennis balls they have armored plates that fit together to make a round shape. b.when the water is disturbed; the organisms respond by glowing this makes swimmers look like floating beams of blue light. c.there is a bay in puerto rico that seems to light up at night; the light comes from tiny organisms in the water. d.the luminescence attracts visitors from around the world people are curious to see; this beautiful otherworldly sight.

During editing and proofreading, you do not need to a. check facts b. follow grammar, usage, and mechanics c. scrutinize spelling d. revise overall structure