Experiment #1 (griffith): you inject mice with a strain of "smooth bacteria. a few days later you find that the
mice have died from pneumonia. you inject different mice with "rough bacteria and find that they all survive.
next, you heat the disease-causing smooth bacteria and then find that all of the mice survive. explain why.
you then decide to heat-kill the disease-causing smooth bacteria and mix them with live harmless rough
bacteria. you inject mice with the live bacteria from the mixture and find that the mice die of pneumonia. you
culture the bacteria to find that there are now live disease-causing smooth bacteria. how do you explain this?

All but one describes an effect of aging on the digestive system. a) decreased acid secretion b) decreased elasticity of stomach c) capacity to resist damage decreases d) food remains in stomach for less time

Which locations on the map are low-pressure areas? a b c d e

For the strategies below, decide whether they are best described as demand-side solutions or supply-side solutions to meeting human needs for fresh water. remember that a demand-side solution reduces demand for fresh water, whereas a supply-side solution increases the supply of fresh water. (a) damming a river to create a reservoir (b) desalinating seawater (c) a nation invading a neighboring country to access their rivers (d) raising water prices for consumers and businesses (e) providing tax breaks for companies that use less water (f) replacing inefficient irrigation with more-efficient drip irrigation to grow crops (g) requiring low-flow showerheads in all new homes