Article: Even as animal domestication became relatively widespread and after the development of agriculture, hunting was usually a significant contributor to the human food supply. The supplementary meat and materials from hunting included protein, bone for implements, sinew for cordage, fur, feathers, rawhide and leather used in clothing. Man's earliest hunting weapons would have included rocks, spears, the atlatl, and bows and arrows. Hunting is still vital in marginal climates, especially those unsuited for pastoral uses or agriculture.[citation needed] For example, Inuit people in the Arctic trap and hunt animals for clothing and use the skins of sea mammals to make kayaks, clothing, and footwear.

Question: Why is hunting still vital in marginal climates?
Ans: unsuited for pastoral uses or agriculture

Article: The earliest known references to the islands as a group appeared in the writings of sea-farers from the ancient Greek colony of Massalia. The original records have been lost; however, later writings, e.g. Avienus's Ora maritima, that quoted from the Massaliote Periplus (6th century BC) and from Pytheas's On the Ocean (circa 325320 BC) have survived. In the 1st century BC, Diodorus Siculus has Prettanike nesos, "the British Island", and Prettanoi, "the Britons". Strabo used (Brettanike), and Marcian of Heraclea, in his Periplus maris exteri, used (the Prettanic Isles) to refer to the islands. Historians today, though not in absolute agreement, largely agree that these Greek and Latin names were probably drawn from native Celtic-language names for the archipelago. Along these lines, the inhabitants of the islands were called the (Priteni or Pretani). The shift from the "P" of Pretannia to the "B" of Britannia by the Romans occurred during the time of Julius Caesar.

Question: When did the "P" sound of Pretannia change to the "B" sound of Britannia?
Ans: during the time of Julius Caesar

Article: Modern evolutionary theory continues to develop. Darwin's theory of evolution by natural selection, with its tree-like model of branching common descent, has become the unifying theory of the life sciences. The theory explains the diversity of living organisms and their adaptation to the environment. It makes sense of the geologic record, biogeography, parallels in embryonic development, biological homologies, vestigiality, cladistics, phylogenetics and other fields, with unrivalled explanatory power; it has also become essential to applied sciences such as medicine and agriculture. Despite the scientific consensus, a religion-based political controversy has developed over how evolution is taught in schools, especially in the United States.

Question: What branching common descent theory has become the most unifying one of the life sciences?
Ans: Darwin's theory of evolution

Article: Heartwood (or duramen) is wood that as a result of a naturally occurring chemical transformation has become more resistant to decay. Heartwood formation occurs spontaneously (it is a genetically programmed process). Once heartwood formation is complete, the heartwood is dead. Some uncertainty still exists as to whether heartwood is truly dead, as it can still chemically react to decay organisms, but only once.

Question: What's another word for "duramen"?
Ans:
Heartwood