Question: The particular contrasts which are phonemic in a language can change over time. At one time, [f] and [v], two sounds that have the same place and manner of articulation and differ in voicing only, were allophones of the same phoneme in English, but later came to belong to separate phonemes. This is one of the main factors of historical change of languages as described in historical linguistics.
Try to answer this question if possible: In the past sounds that now belong to separate phenomes were allophones of what kind  of change in English?
Answer: unanswerable
Question: The Czech dialects spoken in Moravia and Silesia are known as Moravian (moravština). In the Austro-Hungarian Empire, "Bohemian-Moravian-Slovak" was a language citizens could register as speaking (with German, Polish and several others). Of the Czech dialects, only Moravian is distinguished in nationwide surveys by the Czech Statistical Office. As of 2011, 62,908 Czech citizens spoke Moravian as their first language and 45,561 were diglossal (speaking Moravian and standard Czech as first languages).
Try to answer this question if possible: What is it called when you speak both German and Hungarian as your first language?
Answer: unanswerable
Question: The remainder was the world-ocean known as Panthalassa ("all the sea"). All the deep-ocean sediments laid down during the Triassic have disappeared through subduction of oceanic plates; thus, very little is known of the Triassic open ocean. The supercontinent Pangaea was rifting during the Triassic—especially late in the period—but had not yet separated. The first nonmarine sediments in the rift that marks the initial break-up of Pangea—which separated New Jersey from Morocco—are of Late Triassic age; in the U.S., these thick sediments comprise the Newark Supergroup. Because of the limited shoreline of one super-continental mass, Triassic marine deposits are globally relatively rare; despite their prominence in Western Europe, where the Triassic was first studied. In North America, for example, marine deposits are limited to a few exposures in the west. Thus Triassic stratigraphy is mostly based on organisms living in lagoons and hypersaline environments, such as Estheria crustaceans and terrestrial vertebrates.
Try to answer this question if possible: What stratigraphy is mostly based on non-saline organisms?
Answer: unanswerable
Question: The Negritos are believed to be the first inhabitants of Southeast Asia. Once inhabiting Taiwan, Vietnam, and various other parts of Asia, they are now confined primarily to Thailand, the Malay Archipelago, and the Andaman and Nicobar Islands. Negrito means "little black people" in Spanish (negrito is the Spanish diminutive of negro, i.e., "little black person"); it is what the Spaniards called the short-statured, hunter-gatherer autochthones that they encountered in the Philippines. Despite this, Negritos are never referred to as black today, and doing so would cause offense. The term Negrito itself has come under criticism in countries like Malaysia, where it is now interchangeable with the more acceptable Semang, although this term actually refers to a specific group. The common Thai word for Negritos literally means "frizzy hair".
Try to answer this question if possible: Where do the Negritos reside currently?
Answer:
Thailand, the Malay Archipelago, and the Andaman and Nicobar Islands.