Input: Article: During the development of a tree, the lower limbs often die, but may remain attached for a time, sometimes years. Subsequent layers of growth of the attaching stem are no longer intimately joined with the dead limb, but are grown around it. Hence, dead branches produce knots which are not attached, and likely to drop out after the tree has been sawn into boards.

Now answer this question: What will the lower limbs of a tree usually do during development?

Output: die

Article: Geologically, Plymouth has a mixture of limestone, Devonian slate, granite and Middle Devonian limestone. Plymouth Sound, Shores and Cliffs is a Site of Special Scientific Interest, because of its geology. The bulk of the city is built upon Upper Devonian slates and shales and the headlands at the entrance to Plymouth Sound are formed of Lower Devonian slates, which can withstand the power of the sea.

Question: Along with shales, what is most of the city built on?
Ans: Upper Devonian slates

Here is a question about this article: Motors have very little room for electrical insulation so they generally have low voltage ratings. Because transformers (prior to the development of power electronics) cannot step down DC voltages, trains were supplied with a relatively low DC voltage that the motors can use directly. The most common DC voltages are listed in the previous section. Third (and fourth) rail systems almost always use voltages below 1 kV for safety reasons while overhead wires usually use higher voltages for efficiency. ("Low" voltage is relative; even 600 V can be instantly lethal when touched.)
What is the answer to this question: Which system uses higher voltages?
****
So... overhead wires

The problem: Answer a question about this article:
The channel also broadcasts two movie blocks during the late evening hours each Sunday: "Silent Sunday Nights", which features silent films from the United States and abroad, usually in the latest restored version and often with new musical scores; and "TCM Imports" (which previously ran on Saturdays until the early 2000s[specify]), a weekly presentation of films originally released in foreign countries. TCM Underground which debuted in October 2006 is a Friday late night block which focuses on cult films, the block was originally hosted by rocker/filmmaker Rob Zombie until December 2006 (though as of 2014[update], it is the only regular film presentation block on the channel that does not have a host).
On what day is TCM Underground shown?
****
The answer: Friday

Problem: Please answer a question about the following article about Indigenous peoples of the Americas:
According to both indigenous American and European accounts and documents, American civilizations at the time of European encounter had achieved many accomplishments. For instance, the Aztecs built one of the largest cities in the world, Tenochtitlan, the ancient site of Mexico City, with an estimated population of 200,000. American civilizations also displayed impressive accomplishments in astronomy and mathematics. The domestication of maize or corn required thousands of years of selective breeding.
How many years of selective breeding did it take to domesticate maize?
A: thousands

Question: Read this and answer the question

Humans would also have derived enormous benefit from the dogs associated with their camps. For instance, dogs would have improved sanitation by cleaning up food scraps. Dogs may have provided warmth, as referred to in the Australian Aboriginal expression "three dog night" (an exceptionally cold night), and they would have alerted the camp to the presence of predators or strangers, using their acute hearing to provide an early warning.

What did a dog's good hearing help humans with?
Answer:
early warning.