Is danger a proper noun

Are rods and cones specialized nuerons? The Tropic of Cancer is to the Tropic of Capricorn as the Arctic Circle is to what? How many km in 5.4 mm? Why are waterfalls important? How might solar powered buildings and cars reduce the amount of carbon dioxide that is added to the atmosphere? What according to me would enable me to perform better? How does the word chemo and synthesis relate to the meaning of the term chemosynthesis? If you were on the moons near side during a new moon how much of the side of earth facing you would be sunlit? Did Ares have a wife and kids? Where did hurricane Isaac originate? Is the half-life of a given isotope can be altered by heat pressure or some other physical means? What is the solute in harpic? Why are comets only visible some of the time? What is the term for rock formed from magma or lava? Ridges that form along the sides of glacial valleys as a glacier melts are called what? What do you do if bromothymol blue indicator is ingested? Why is necessary to test saliva for starch and sugar? What are the two solutions in the mixture of making salt? How many centimeters in 1.06m? What is 100 times longer than 65mm in centimetres?