Which is the closest synonym for the word instinct?

Reading a stream of consciousness narrative is like reading a journal that is unedited and unorganized. reading a book that is based on facts. reading something that is clear and easy to understand.

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.

What effect does the revelation of nachiketas's reception of shraddaha in part ii have upon the reader's perception of the unfolding story?