How is a year described?

How old is the Milky Way? Should companies be able the DNA contained in plant seeds? Do fingertips have sweat glands? How are earthquakes predicted in California? Is glycogen storage long term or short term? What do you do when there is no cartlidge left in ankle joint? How often does it take the earth rotate? Is diamonds a raw material? An oar used to row a boat has a handle 160 cm from the fulcrum and the blade 40 cm from the fulcrum What is the ideal mechanical advantage of the oar? Why are your English laurel leaves turning yellow in June? What will happen to water at its boiling point at a given pressure? What is the molarity of 48.6 g of magnesium ions in 2LH2O? Why do band spread in liquid chromatography? What are the bases on tRNA called? Do humans respirate aeorobic or anaroebic? What instrument s are used in modern tango? Which on is smaller a meter or a kilometer? What would happen if broca's area got damaged? What is an abstract noun for nice? What conditions cause cells to break down fat muscles?