Problem: Horizontal gene transfer is invoked to explain how there is often extreme similarity between small portions of the genomes of two organisms that are otherwise very distantly related. Horizontal gene transfer seems to be common among many microbes. Also, eukaryotic cells seem to have experienced a transfer of some genetic material from their chloroplast and mitochondrial genomes to their nuclear chromosomes.
What helps explain why different parts of chloroplasts are similar?
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Answer: unanswerable


Problem: In 1903, Brigham Young Academy was dissolved, and was replaced by two institutions: Brigham Young High School, and Brigham Young University. (The BY High School class of 1907 was ultimately responsible for the famous giant "Y" that is to this day embedded on a mountain near campus.) The Board elected George H. Brimhall as the new President of BYU. He had not received a high school education until he was forty. Nevertheless, he was an excellent orator and organizer. Under his tenure in 1904 the new Brigham Young University bought 17 acres (69,000 m2) of land from Provo called "Temple Hill". After some controversy among locals over BYU's purchase of this property, construction began in 1909 on the first building on the current campus, the Karl G. Maeser Memorial. Brimhall also presided over the University during a brief crisis involving the theory of evolution. The religious nature of the school seemed at the time to collide with this scientific theory. Joseph F. Smith, LDS Church president, settled the question for a time by asking that evolution not be taught at the school. A few have described the school at this time as nothing more than a "religious seminary". However, many of its graduates at this time would go on to great success and become well renowned in their fields.
What topic was excluded from being taught at BYU?
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Answer: evolution


Problem: In Hellenistic Egypt, the mathematician Euclid laid down the foundations of mathematical rigor and introduced the concepts of definition, axiom, theorem and proof still in use today in his Elements, considered the most influential textbook ever written. Archimedes, considered one of the greatest mathematicians of all time, is credited with using the method of exhaustion to calculate the area under the arc of a parabola with the summation of an infinite series, and gave a remarkably accurate approximation of Pi. He is also known in physics for laying the foundations of hydrostatics, statics, and the explanation of the principle of the lever.
What was contained within the book Elements?
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Answer:
the foundations of mathematical rigor