Which of the following is not an example of mechanical control of nonnative species?

an earnest tone.

because portia wants to know why brutus has been acting strange lately.

international economic development agencies harm poorer nations by encouraging them to serve as exporters to wealthier nations.

a sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°c. if the system is at dynamic equilibrium, which of these statements is true?  

answer; (b) asia;