Problem: Immunology:

Clinical immunology is the study of diseases caused by disorders of the immune system (failure, aberrant action, and malignant growth of the cellular elements of the system). It also involves diseases of other systems, where immune reactions play a part in the pathology and clinical features.

Where can these three elements occur in the immune system?
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A: cellular elements

Problem: The Federalist Party of the United States was opposed by the Democratic-Republicans, including powerful figures such as Thomas Jefferson. The Democratic-Republicans mainly believed that: the Legislature had too much power (mainly because of the Necessary and Proper Clause) and that they were unchecked; the Executive had too much power, and that there was no check on the executive; a dictator would arise; and that a bill of rights should be coupled with the constitution to prevent a dictator (then believed to eventually be the president) from exploiting or tyrannizing citizens. The federalists, on the other hand, argued that it was impossible to list all the rights, and those that were not listed could be easily overlooked because they were not in the official bill of rights. Rather, rights in specific cases were to be decided by the judicial system of courts.
What was the federalist party of the United States opposed to?
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Answer: Democratic-Republicans

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
The absence of a formal mechanism within the Conservative Party for choosing a leader meant that, following Eden's resignation, it fell to the Queen to decide whom to commission to form a government. Eden recommended that she consult Lord Salisbury, the Lord President of the Council. Lord Salisbury and Lord Kilmuir, the Lord Chancellor, consulted the British Cabinet, Winston Churchill, and the Chairman of the backbench 1922 Committee, resulting in the Queen appointing their recommended candidate: Harold Macmillan.
What occupation was Harold Macmillan at the time?
A: unanswerable

Context and question: Given the wide range of styles in classical music, from Medieval plainchant sung by monks to Classical and Romantic symphonies for orchestra from the 1700s and 1800s to avant-garde atonal compositions for solo piano from the 1900s, it is difficult to list characteristics that can be attributed to all works of that type. However, there are characteristics that classical music contains that few or no other genres of music contain, such as the use of a printed score and the performance of very complex instrumental works (e.g., the fugue). As well, although the symphony did not exist through the entire classical music period, from the mid-1700s to the 2000s the symphony ensembleand the works written for ithave become a defining feature of classical music.
Who sang medieval plainchant?
Answer: monks

Question: 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.
Is there an answer to this question: What is the process called in which plants gather nutrients from the soil around their roots?

Answer: cation exchange

Question: In May 2005, the first high definition video conferencing systems, produced by LifeSize Communications, were displayed at the Interop trade show in Las Vegas, Nevada, able to provide video at 30 frames per second with a 1280 by 720 display resolution. Polycom introduced its first high definition video conferencing system to the market in 2006. As of the 2010s, high definition resolution for videoconferencing became a popular feature, with most major suppliers in the videoconferencing market offering it.
Is there an answer to this question: What was the resolution of the first HD video conferencing system?

Answer:
1280 by 720