input question: Extract the answer to the question from the following context. Question: What do plants get from soil? Context: Plants uptake essential elements from the soil through their roots and from the air (consisting of mainly nitrogen and oxygen) through their leaves. Green plants obtain their carbohydrate supply from the carbon dioxide in the air by the process of photosynthesis. Carbon and oxygen are absorbed from the air, while other nutrients are absorbed from the soil. Nutrient uptake in the soil is achieved by cation exchange, wherein root hairs pump hydrogen ions (H+) into the soil through proton pumps. These hydrogen ions displace cations attached to negatively charged soil particles so that the cations are available for uptake by the root. In the leaves, stomata open to take in carbon dioxide and expel oxygen. The carbon dioxide molecules are used as the carbon source in photosynthesis.???
output answer: essential elements

input question: Extract the answer to the question from the following context. Question: How were the ideals grouped? Context: The Republic of Letters was the sum of a number of Enlightenment ideals: an egalitarian realm governed by knowledge that could act across political boundaries and rival state power. It was a forum that supported "free public examination of questions regarding religion or legislation". Immanuel Kant considered written communication essential to his conception of the public sphere; once everyone was a part of the "reading public", then society could be said to be enlightened. The people who participated in the Republic of Letters, such as Diderot and Voltaire, are frequently known today as important Enlightenment figures. Indeed, the men who wrote Diderot's Encyclopédie arguably formed a microcosm of the larger "republic".???
output answer: The Republic of Letters

input question: Extract the answer to the question from the following context. Question: Which of the following is not an example of a type of shoot: stolons, willows, or tubers? Context: The root system and the shoot system are interdependent – the usually nonphotosynthetic root system depends on the shoot system for food, and the usually photosynthetic shoot system depends on water and minerals from the root system. Cells in each system are capable of creating cells of the other and producing adventitious shoots or roots. Stolons and tubers are examples of shoots that can grow roots. Roots that spread out close to the surface, such as those of willows, can produce shoots and ultimately new plants. In the event that one of the systems is lost, the other can often regrow it. In fact it is possible to grow an entire plant from a single leaf, as is the case with Saintpaulia, or even a single cell – which can dedifferentiate into a callus (a mass of unspecialised cells) that can grow into a new plant. In vascular plants, the xylem and phloem are the conductive tissues that transport resources between shoots and roots. Roots are often adapted to store food such as sugars or starch, as in sugar beets and carrots.???
output answer: willows

input question: Extract the answer to the question from the following context. Question: What is the symbolism of the dog? Context: The theme of racial injustice appears symbolically in the novel as well. For example, Atticus must shoot a rabid dog, even though it is not his job to do so. Carolyn Jones argues that the dog represents prejudice within the town of Maycomb, and Atticus, who waits on a deserted street to shoot the dog, must fight against the town's racism without help from other white citizens. He is also alone when he faces a group intending to lynch Tom Robinson and once more in the courthouse during Tom's trial. Lee even uses dreamlike imagery from the mad dog incident to describe some of the courtroom scenes. Jones writes, "[t]he real mad dog in Maycomb is the racism that denies the humanity of Tom Robinson .... When Atticus makes his summation to the jury, he literally bares himself to the jury's and the town's anger."???
output answer:
prejudice within the town of Maycomb