The local campground, which features tents with comfortable mattresses, electricity, and
portable heaters, is part of a camping trend called "glamping," or luxury camping.
There is only one local campground.
There is more than one local campground.

Use a pronoun to refer to two or more singular antecedents joined by or or not

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.

How are w.h auden’s “musée des beaux arts” and william carlos williams’s “landscape with the fall of icarus” similar?