A. Describe the effect of standard of living on tooth decay in town A. b. Suggest reasons why a low standard of living may have the effect you describe in your answer to a.

c. Describe the effect of adding fluoride to drinking water that does not naturally contain fluoride.

d. Suggest reasons for the differences in the results for town B and town C.

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

As molecules are formed from metabolism, entropy __ and the universe becomes less disordered. a. is decreased b. is increased c. moves closer to equilibrium d. is unchanged

Which atmospheric later is where earths northern and southern lights occur