Phobias: Neopharmaphobia- Fear of new ______?

Questions

One gram of pcbs can make up to ____________ litres of water unsuitable for freshwater aquatic life?

One need only be 16 to do what (without parental consent) in Georgia?

One of the five main senses, by which sound waves are perceived by the ear in vertebrate animals?

One of the hard protuberances that grows from the foreheads or snouts of various hoofed mammals, such as rhinoceroses, deer, giraffes, goats, & cattle?

One of the planets in the solar system, the second in distance from the sun?