Giving this to a witness means that he or she is free from the threat of prosecution.
perjury
subpoena
contempt
immunity

congressional committees may punish people who refuse to testify by
holding them in contempt.
issuing a subpoena.
arresting them for perjury.
giving them immunity.

through this power, congress can check on how the executive branch is administering the law.
immunity
legislative oversight
perjury
subpoena

the period of human evolution has coincided with environmental change, including ('hominin' refers to any bipedal species closely related to humans – that is, on how do we know earth's climate has changed? a map showing dates and locations of prehistoric archeological sites and migration routes from africa into.

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.