Sort the states of water by density, from least dense (top) to most dense (bottom).

Ice

Water Vapor

Liquid Water

Water Vapor - (least dense)

Ice

Liquid Water - (most dense)

Explanation:

While you would expect that the density of a substance increases with lowered temperatures - because the particles get closer together hence there are more particles of the substance per unit volume at lower temperatures-, there is an exception in water. It is even called water anomaly.

Ice, which is the solid and most compact form of water, is less dense than water at 4° Centigrade. This is why ice sheets float on oceans in the polar regions.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

did you fail the test? xd