What are the main characteristics of America?

Why doesn't air pressure crush an empty soft drink can as you go down a mountain? A place where gas is stored? A unit that measures force? What does a normal vampire do? What is the best science experiment in the world? Convert 5um into meters using scientific notation? Is an IQ of 142 for a 15 year old good? Do you use a comma with as well at the end of a sentence? What direction is the earth's revolution? What is the symbol for matter? Scientists know that organisms that are more closely related will have DNA sequences more similar to each other than organisms that are distantly related Which two organisms below would most likely h? Why is it important to do back-ground research prior to forming a hypothesis? Is evolution valid? How most archeological sites discovered? What are abnormal results of a Cold Agglutinins Test? How does increase in temperature affect the solubility of a gas? How many cans in a slab? When you have too much material you have to narrow down the topic but when you have too little material you have to stretch to make connections? How might bad science be caught after it if published? What are the difference between a robot and a human?