Is amazon rainforest a proper noun or common noun?

What is the toxicity of foscarnet? What is a laboratory medium? Is a string smaller than an atom? What are limiting factors for ghost crabs? What is the closest volcano to Florida? To be respectfully aware of the comings and goings of lif? What substance acts to prevent sudden pH changes in bodily fluid? What is the process by which cell obtain food molecule to support their other activities? How many teaspoons are in 1.75? Which best describes how your understanding of DNA and inherited traist has changed overtime? Many stars give out more light than sun but they look fainter explain why? What does 14 mean in carbon 14? What is the rising air mass that becomes cooled and the water vapor? What are the advantages of socket and spigot joint? Describe in general all the things that happen to the water that falls on the land? Is venus jovian or terrestrial? When the earth formed naturally occurring radioactive materials? Does the hypothalamus control circadian rhythms? What does secretion refer to? Does the lateral line system on a fish have a function?