Problem: Please answer a question about the following article about Wood:
If a heavy piece of pine is compared with a lightweight piece it will be seen at once that the heavier one contains a larger proportion of latewood than the other, and is therefore showing more clearly demarcated growth rings. In white pines there is not much contrast between the different parts of the ring, and as a result the wood is very uniform in texture and is easy to work. In hard pines, on the other hand, the latewood is very dense and is deep-colored, presenting a very decided contrast to the soft, straw-colored earlywood.
What type of tree has very little contrast between parts of its growth rings?
A: white pines
Problem: Please answer a question about the following article about Professional wrestling:
Submission was initially a large factor in professional wrestling, but following the decline of the submission-oriented catch-as-catch-can style from mainstream professional wrestling, the submission largely faded until the rise of the legitimate sport of mixed martial arts. Despite this, some wrestlers, such as Chris Jericho, The Undertaker, Ric Flair, Bret Hart, Kurt Angle, Ken Shamrock, Dean Malenko, Chris Benoit, and Tazz, became famous for winning matches via submission. A wrestler with a signature submission technique is portrayed as better at applying the hold, making it more painful or more difficult to get out of than others who use it, or can be falsely credited as inventing the hold (such as when Tazz popularized the kata ha jime judo choke in pro wrestling as the "Tazzmission").
What legitimate sport related to wrestling began to become popular?
A: mixed martial arts
Problem: Please answer a question about the following article about Brain:
The first vertebrates appeared over 500 million years ago (Mya), during the Cambrian period, and may have resembled the modern hagfish in form. Sharks appeared about 450 Mya, amphibians about 400 Mya, reptiles about 350 Mya, and mammals about 200 Mya. Each species has an equally long evolutionary history, but the brains of modern hagfishes, lampreys, sharks, amphibians, reptiles, and mammals show a gradient of size and complexity that roughly follows the evolutionary sequence. All of these brains contain the same set of basic anatomical components, but many are rudimentary in the hagfish, whereas in mammals the foremost part (the telencephalon) is greatly elaborated and expanded.
During which scientific period did vertebrates appear?
A: Cambrian period
Problem: Please answer a question about the following article about Classical music:
Classical music has often incorporated elements or material from popular music of the composer's time. Examples include occasional music such as Brahms' use of student drinking songs in his Academic Festival Overture, genres exemplified by Kurt Weill's The Threepenny Opera, and the influence of jazz on early- and mid-20th-century composers including Maurice Ravel, exemplified by the movement entitled "Blues" in his sonata for violin and piano. Certain postmodern, minimalist and postminimalist classical composers acknowledge a debt to popular music.
Popular music from the composer's time was incorporation into what?
A:
Classical music