What is pertubence?

What are the positive and negative impacts of niels bohr's work? Is a willow ptarmigan a carnivore? What are the 5 kingdoms called? What is the pH of 6.3 x 10-4M? Why does the temperature zone support many varieties of organism? What is 4500 yards converted into miles? What is the process of detrifying? Why was Galileo able to see only Jupiter's largest moons? Is thiamine organic or inorganic? What are the purines in RNA? What is endowed research chair? Are milligrams kilograms and gallons liquid measurements? How will a hurricane affect people's safety? Which forms at mid-ocean ridges? What metal element is the most reactive? How does the water cycle effect the salinity in the ocean? Does the Mediterranean Sea have warm water? What is the difference between working principle of XRF and XRD? Why were Amerigo Vespucci's findings so important? Microorganisms in the water cycle?