Vegetation, conservation and reestablishment of forest and wetlands can prevent further... crop production

irrigation

soil degradation

deforestation

the first question's answer is a.

even though you have attached neither the chart nor the generalizations, i have located them online. the right answer is d, since they are asking you about a generalization. you can only infer from the chart that between 2008 and 2009 the number of employed workers decreased significantly (from over 115 millions to 107 millions approximately), which signals some type of economic crisis.  

answer; obscene;

she recieved a treatment not thought to be specifically effective in treating her disorder.