What are the 5 space disasters?

Why do genetilia smell? Do ice cubes melt faster when salt is added? Deternain the atomic mass of an element that has 2 isotopes with mass numbers of 6 mass 6.02 and 7 mass 7.02 the relative abundences are 7.42 and 92.6 respectively? The home of a eukaryotic cell's hereditary material? What connects orbit to nasal cavity? What Code specifies the amino acids and start and stop signals with their Codons? How long are the rockies in miles? How do gas expand? What chemical properties do dry ice and water ice have different? If you had constipation and diareha at the same time what would happen? What is the chemical symbol for one element with an electron configuration that ends with np2 where n is ant principal quantum number? Why does bar soap crack? Under what growing conditions would you expect to find pioneer plants such as mosses and liverworts? Why cant you drink soda when you have your period? What is the appropriate length of the geologic time scale? When and where did mount tiede erupt? When did Jyutei Senki happen? Can you eliminate microorganisms on earth? How aquificae reproduces? What are the medicines for a sexually unfit man?