Carbohydrates, such as glucose, are excellent sources of immediate energy for living organisms. more complex carbohydrates, such as glycogen and starch, can also be used for the long term storage of energy. however, carbohydrates play other vital roles, too. which of the following describes another common use for carbohydrates?
a. cellulose is used as a structural component in plant cell walls.
b. collagen is a major component in cartilage and tendons.
c. enzymes speed up metabolic reactions.
d. keratin provides support in hair, nails, feathers, hooves, and some animal shells

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