Which of the following statements about speciation is true? which of the following statements about speciation is true? speciation cannot occur in the absence of mutation. speciation cannot occur in the absence of natural selection. speciation cannot occur in the absence of genetic drift. speciation will occur more slowly if the population is large and gene flow is high.

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?

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

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above