Fossil fuels contain energy that originally came from a. tidal forces. b. earth’s core. c. the sun. d. dinosaurs.

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

Chloroplasts and bacteria are in size. a. similar b. at different ends of the size range c. exactly the same d. none of these

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