QUES: The history of biodiversity during the Phanerozoic (the last 540 million years), starts with rapid growth during the Cambrian explosiona period during which nearly every phylum of multicellular organisms first appeared. Over the next 400 million years or so, invertebrate diversity showed little overall trend, and vertebrate diversity shows an overall exponential trend. This dramatic rise in diversity was marked by periodic, massive losses of diversity classified as mass extinction events. A significant loss occurred when rainforests collapsed in the carboniferous. The worst was the Permian-Triassic extinction event, 251 million years ago. Vertebrates took 30 million years to recover from this event.
The Phanerozoic era covers what time period?

ANS: the last 540 million years

QUES: On 9 September the OKL appeared to be backing two strategies. Its round-the-clock bombing of London was an immediate attempt to force the British government to capitulate, but it was also striking at Britain's vital sea communications to achieve a victory through siege. Although the weather was poor, heavy raids took place that afternoon on the London suburbs and the airfield at Farnborough. The day's fighting cost Kesselring and Luftflotte 2 (Air Fleet 2) 24 aircraft, including 13 Bf 109s. Fighter Command lost 17 fighters and six pilots. Over the next few days weather was poor and the next main effort would not be made until 15 September 1940.
FighterCommand lost how many fighters?

ANS: 17

QUES: Hong Taiji's bureaucracy was staffed with many Han Chinese, including many newly surrendered Ming officials. The Manchus' continued dominance was ensured by an ethnic quota for top bureaucratic appointments. Hong Taiji's reign also saw a fundamental change of policy towards his Han Chinese subjects. Nurhaci had treated Han in Liaodong differently according to how much grain they had, those with less than 5 to 7 sin were treated like chattel while those with more than that amount were rewarded with property. Due to a revolt by Han in Liaodong in 1623, Nurhachi, who previously gave concessions to conquered Han subjects in Liaodong, turned against them and ordered that they no longer be trusted; He enacted discriminatory policies and killings against them, while ordering that Han who assimilated to the Jurchen (in Jilin) before 1619 be treated equally as Jurchens were and not like the conquered Han in Liaodong. Hong Taiji instead incorporated them into the Jurchen "nation" as full (if not first-class) citizens, obligated to provide military service. By 1648, less than one-sixth of the bannermen were of Manchu ancestry. This change of policy not only increased Hong Taiji's manpower and reduced his military dependence on banners not under his personal control, it also greatly encouraged other Han Chinese subjects of the Ming dynasty to surrender and accept Jurchen rule when they were defeated militarily. Through these and other measures Hong Taiji was able to centralize power unto the office of the Khan, which in the long run prevented the Jurchen federation from fragmenting after his death.
Where did a Han revolt occur?

ANS: Liaodong

QUES: Logical empiricism (also logical positivism or neopositivism) was an early 20th-century attempt to synthesize the essential ideas of British empiricism (e.g. a strong emphasis on sensory experience as the basis for knowledge) with certain insights from mathematical logic that had been developed by Gottlob Frege and Ludwig Wittgenstein. Some of the key figures in this movement were Otto Neurath, Moritz Schlick and the rest of the Vienna Circle, along with A.J. Ayer, Rudolf Carnap and Hans Reichenbach.
What was Ludwig Wittgenstein part of?

ANS:
unanswerable