Which of the following statements is true?

speciation can happen when gene flow is reduced.

geographic isolation can cause an increase in genetic drift.

gene flow tends to increase differences between populations.

natural selection is random.

Which two countries on the received the most total aid in 1948, the first year of the marshall plan?

What did passage of the immigration act of 1965 accomplish? the law lowered the number of asians allowed to immigrate to the us. the law allowed no more immigration from european nations. the law supported victims of political persecution. the law made an effort to establish a quota system.

97 points what types of changes have been made in the united states to protect people from earthquakes? a. communities are no longer located along fault lines. b. building codes ensure that structures can withstand shaking. c. warnings go off when an earthquake is expected, and people evacuate the area. d. barriers have been built to prevent flooding by a tsunami.