Which of the following explains the relationship between genes and chromosomes?
a. chromosomes come in different versions called genes.
b. genes come in different versions called chromosomes.
c. chromosomes are structures that are made up of two versions of
multiple genes.
d. genes are structures that are made up of multiple chromosomes.

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