There is an island in the middle of a large river that houses a large population of ants. damming of the river causes the island to flood and only the highest points of the island are now above water. the ants cannot swim, so are now in multiple isolated populations. which of the following best describes this event?
a. isolation by dispersal
b. isolation by vicariance
c. a form of sympatric speciation
d. only a rare development of polyploidy could lead to speciation in this case
e. speciation will not occur in this case because of gene flow

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