What is the significance of minus 6 degrees Celsius to minus 18 degrees Celsius?

How much is 4.54 liters? Do rhombuses have right angles? What does it mean when you say whatever? This structure has been shown to be composed of three distinct zones or layers and is semipermeable? What did Nelly Bly invent? How many litres in 150 gallons? Do people eat lions? What is the difference between websites aligned left in a browser and others that are aligned central? How many kilos in a 405 lbc? Where can you buy test tubes? What did scientists discover in the bark of the pacific yew? What is the most primitive class of fish called? Why was it important for Mendel to count large numbers of plants? How do you keep bugs out of my room? Give the main division of science? What does the abbreviation gsr refer to? Are Forms of Energy Made of Elements? What is rayon fabric? How could a microscope be a good gift? Are magnets recyclable?