The united states department of agriculture has historically published recommendations for healthy eating based on a food pyramid. this concept has been reimagined with the introduction of their new website this interactive website allows individuals to explore healthy menus tailored to their particular needs. the website also provides information about physical activity, caloric intake, and food groups. what is the author's purpose?

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.