Problem: Please answer a question about the following article about Energy:
It would appear that living organisms are remarkably inefficient (in the physical sense) in their use of the energy they receive (chemical energy or radiation), and it is true that most real machines manage higher efficiencies. In growing organisms the energy that is converted to heat serves a vital purpose, as it allows the organism tissue to be highly ordered with regard to the molecules it is built from. The second law of thermodynamics states that energy (and matter) tends to become more evenly spread out across the universe: to concentrate energy (or matter) in one specific place, it is necessary to spread out a greater amount of energy (as heat) across the remainder of the universe ("the surroundings").[note 3] Simpler organisms can achieve higher energy efficiencies than more complex ones, but the complex organisms can occupy ecological niches that are not available to their simpler brethren. The conversion of a portion of the chemical energy to heat at each step in a metabolic pathway is the physical reason behind the pyramid of biomass observed in ecology: to take just the first step in the food chain, of the estimated 124.7 Pg/a of carbon that is fixed by photosynthesis, 64.3 Pg/a (52%) are used for the metabolism of green plants, i.e. reconverted into carbon dioxide and heat.
Complex organisms can occupy this, that are not available to their simpler brethern?
A: ecological niches
Problem: Please answer a question about the following article about Josip Broz Tito:
After 13 months at the hospital, Broz was sent to a work camp in the Ural Mountains where prisoners selected him for their camp leader. In February 1917, revolting workers broke into the prison and freed the prisoners. Broz subsequently joined a Bolshevik group. In April 1917, he was arrested again but managed to escape and participate in the July Days demonstrations in Petrograd (St. Petersburg) on 16–17 July 1917. On his way to Finland, Broz was caught and imprisoned in the Peter and Paul Fortress for three weeks. He was again sent to Kungur, but escaped from the train. He hid with a Russian family in Omsk, Siberia where he met his future wife Pelagija Belousova. After the October Revolution, he joined a Red Guard unit in Omsk. Following a White counteroffensive, he fled to Kirgiziya and subsequently returned to Omsk, where he married Belousova. In the spring of 1918, he joined the Yugoslav section of the Russian Communist Party. By June of the same year, Broz left Omsk to find work and support his family, and was employed as a mechanic near Omsk for a year.
Where did Broz marry Belousova?
A: Omsk
Problem: Please answer a question about the following article about Black people:
Genetic studies have found significant African female-mediated gene flow in Arab communities in the Arabian Peninsula and neighboring countries, with an average of 38% of maternal lineages in Yemen are of direct African descent, 16% in Oman-Qatar, and 10% in Saudi Arabia-United Arab Emirates.
How many people in Yemen have African lineage? 
A: average of 38%
Problem: Please answer a question about the following article about Vacuum:
While outer space provides the most rarefied example of a naturally occurring partial vacuum, the heavens were originally thought to be seamlessly filled by a rigid indestructible material called aether. Borrowing somewhat from the pneuma of Stoic physics, aether came to be regarded as the rarefied air from which it took its name, (see Aether (mythology)). Early theories of light posited a ubiquitous terrestrial and celestial medium through which light propagated. Additionally, the concept informed Isaac Newton's explanations of both refraction and of radiant heat. 19th century experiments into this luminiferous aether attempted to detect a minute drag on the Earth's orbit. While the Earth does, in fact, move through a relatively dense medium in comparison to that of interstellar space, the drag is so minuscule that it could not be detected. In 1912, astronomer Henry Pickering commented: "While the interstellar absorbing medium may be simply the ether, [it] is characteristic of a gas, and free gaseous molecules are certainly there".
What was originally believed the heavens were filled with?
A:
aether