What is purpasis?

Why cant you use liquid hydrogen as fuel? What are 6 major elements that make up organisms? Are most experiments in ecology are quick and done in a lab? If you wanted to observe a living organism an an amoeba for example which type of micrope would you use? What are some things that contain silicon? Experimental results must be qualitative and open for interpretation ture or false? What are the descriptions of the 4 main regions of California? Can you freeze icing? Of the 20 common amino acids how many of these are termed essential? Why human beings is not rotating according to the earth rotation? If a base is inserted or deleted What is the mutation? What is Newton's law of gravitational pull? How many kilograms in 11 tons? What are outflow channels on mars? What causes rubber bands to lose elasticity rapidly in Las Vegas desert? Will naphthalene explode if mixed with acetone? When grass is randomly distributed throughout an environment a population of deer that eats grass is most likely to have a what pattern? How many pounds of freon to recharge a 1999 Mercury Cougar? Can hard hail go through an umbrella? Where Only 5 percent of all earthquakes occur within?