What are the absence of national identity and integration on national security and democratic governance in the world?

A nation state is a state in which the great majority shares the same culture and is conscious of it. The nation state is an ideal in which cultural boundaries match up with political ones.[1] According to one definition, "a nation state is a sovereign state of which most of its subjects are united also by factors which defined a nation such as language or common descent."[2] It is a more precise concept than "country", since a country does not need to have a predominant ethnic group.

A nation, in the sense of a common ethnicity, may include a diaspora or refugees who live outside the nation-state; some nations of this sense do not have a state where that ethnicity predominates

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.