Which of the following statements is correct? question 21 options: a) the use of pollution permits and corrective taxes reduces the cost of environmental protection. b) rich countries usually have cleaner environments than poor countries because a clean environment is like other normal goods in that it has a positive income elasticity. c) clean water and clean air are goods to which the law of demand applies. d) all of the above are correct.

Which type of evidence would support the author's claim?

The ideas of hammond are most clearly an example of which of the following mid-19th century developments? (5 points) the increasingly liberal nature of slavery after the south enforced stronger slave codes the growing use by northern antislavery activists of moral arguments the increasing number of freed slaves in southern states as a result of gradual emancipation laws the growing tendency of southern slaveholders to use the paternal ethos to justify slavery

Which factors are examples of how technology may have affected the great migration apex