Question: There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a spin of 32. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours. Seven metastable isotopes have been characterized, with 68mCu the longest-lived with a half-life of 3.8 minutes. Isotopes with a mass number above 64 decay by , whereas those with a mass number below 64 decay by +. 64Cu, which has a half-life of 12.7 hours, decays both ways.
Try to answer this question if possible: How many isotopes are missing in copper?
Answer: unanswerable
Question: Having small population size is a characteristic almost universally inherent to apex predators, humans and dogs by far the most blatant exceptions. Low numbers wouldn't be a problem for apex predators if there was an abundance of prey and no competition or niche overlap, a scenario that is rarely, if ever, encountered in the wild. The competitive exclusion principle states that if two species' ecological niches overlap, there is a very high likelihood of competition as both species are in direct competition for the same resources. This factor alone could lead to the extirpation of one or both species, but is compounded by the added factor of prey abundance.
Try to answer this question if possible: When two species have a small population, what is likely to happen between them?
Answer: unanswerable
Question: Josip Broz Tito received a total of 119 awards and decorations from 60 countries around the world (59 countries and Yugoslavia). 21 decorations were from Yugoslavia itself, 18 having been awarded once, and the Order of the National Hero on three occasions. Of the 98 international awards and decorations, 92 were received once, and three on two occasions (Order of the White Lion, Polonia Restituta, and Karl Marx). The most notable awards included the French Legion of Honour and National Order of Merit, the British Order of the Bath, the Soviet Order of Lenin, the Japanese Order of the Chrysanthemum, the German Federal Cross of Merit, and the Order of Merit of Italy.
Try to answer this question if possible: Which government awards the Legion of Honour and the National Order of Merit?
Answer: French
Question: To finance state government operations, Alaska depends primarily on petroleum revenues and federal subsidies. This allows it to have the lowest individual tax burden in the United States. It is one of five states with no state sales tax, one of seven states that do not levy an individual income tax, and one of the two states that has neither. The Department of Revenue Tax Division reports regularly on the state's revenue sources. The Department also issues an annual summary of its operations, including new state laws that directly affect the tax division.
Try to answer this question if possible: How many US states do not collect an individual income tax?
Answer:
seven