A student set up a controlled experiment to investigate the conditions needed for germination. She placed moist cotton wool and soaked alfalfa seeds in two large sealed flasks. Flask A contained sodium pyrogallate solution, which absorbs oxygen from the air. Flask B contained sodium hydroxide solution, which absorbs carbon dioxide from the air. After 24 hours, she found that the seeds had germinated in flask B only.

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