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The fossil record suggests that the last few million years featured the greatest biodiversity in history. However, not all scientists support this view, since there is uncertainty as to how strongly the fossil record is biased by the greater availability and preservation of recent geologic sections. Some scientists believe that corrected for sampling artifacts, modern biodiversity may not be much different from biodiversity 300 million years ago., whereas others consider the fossil record reasonably reflective of the diversification of life. Estimates of the present global macroscopic species diversity vary from 2 million to 100 million, with a best estimate of somewhere near 9 million, the vast majority arthropods. Diversity appears to increase continually in the absence of natural selection.

Why are some scientists uncertain about the fossil record?
Answer: how strongly the fossil record is biased by the greater availability and preservation of recent geologic sections.
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Since the 1990s food has become a more important part of a pub's trade, and today most pubs serve lunches and dinners at the table in addition to (or instead of) snacks consumed at the bar. They may have a separate dining room. Some pubs serve meals to a higher standard, to match good restaurant standards; these are sometimes termed gastropubs.

Along with dinners, what meals do modern pubs often serve?
Answer: lunches
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The Grands Magasins Dufayel was a huge department store with inexpensive prices built in 1890 in the northern part of Paris, where it reached a very large new customer base in the working class. In a neighborhood with few public spaces, it provided a consumer version of the public square. It educated workers to approach shopping as an exciting social activity not just a routine exercise in obtaining necessities, just as the bourgeoisie did at the famous department stores in the central city. Like the bourgeois stores, it helped transform consumption from a business transaction into a direct relationship between consumer and sought-after goods. Its advertisements promised the opportunity to participate in the newest, most fashionable consumerism at reasonable cost. The latest technology was featured, such as cinemas and exhibits of inventions like X-ray machines (that could be used to fit shoes) and the gramophone.

What were employees taught that made a shopping experience different?
Answer:
exciting social activity not just a routine exercise in obtaining necessities