Given a context passage, generate a question from the passage such that its answer is shortest continous span from the passage.

Q: Carbon is one of the most common elements found in living organisms. Chains of carbon molecules form the backbones of many organic molecules, such as carbohydrates, proteins, and lipids. Carbon is constantly cycling between living organisms and the atmosphere ( Figure 1.1). The cycling of carbon occurs through the carbon cycle. Living organisms cannot make their own carbon, so how is carbon incorporated into living organisms? In the atmosphere, carbon is in the form of carbon dioxide gas (CO2 ). Recall that plants and other producers capture the carbon dioxide and convert it to glucose (C6 H12 O6 ) through the process of photosynthesis. Then as animals eat plants or other animals, they gain the carbon from those organisms. The chemical equation of photosynthesis is 6CO2 + 6H2 O C6 H12 O6 + 6O2 . How does this carbon in living things end up back in the atmosphere? Remember that we breathe out carbon dioxide. This carbon dioxide is generated through the process of cellular respiration, which has the reverse chemical reaction as photosynthesis. That means when our cells burn food (glucose) for energy, carbon dioxide is released. We, like all animals, exhale this carbon dioxide and return it back to the atmosphere. Also, carbon is released to the atmosphere as an organism dies and decomposes. Cellular respiration and photosynthesis can be described as a cycle, as one uses carbon dioxide (and water) and makes oxygen (and glucose), and the other uses oxygen (and glucose) and makes carbon dioxide (and water). The carbon cycle. The cycling of car- bon dioxide in photosynthesis and cellular respiration are main components of the carbon cycle. Carbon is also returned to the atmosphere by the burning of organic matter (combustion) and fossil fuels and decomposition of organic matter. Millions of years ago, there were so many dead plants and animals that they could not completely decompose before they were buried. They were covered over by soil or sand, tar or ice. These dead plants and animals are organic matter made out of cells full of carbon-containing organic compounds (carbohydrates, lipids, proteins and nucleic acids). What happened to all this carbon? When organic matter is under pressure for millions of years, it forms fossil fuels. Fossil fuels are coal, oil, and natural gas. When humans dig up and use fossil fuels, we have an impact on the carbon cycle ( Figure 1.2). This carbon is not recycled until it is used by humans. The burning of fossil fuels releases more carbon dioxide into the atmosphere than is used by photosynthesis. So, there is more carbon dioxide entering the atmosphere than is coming out of it. Carbon dioxide is known as a greenhouse gas, since it lets in light energy but does not let heat escape, much like the panes of a greenhouse. The increase of greenhouse gasses in the atmosphere is contributing to a global rise in Earths temperature, known as global warming or global climate change.

A: when organisms die, what process returns their carbon back into the atmosphere?
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Q: In this phase 2 proof-of-concept study we examined the safety and efficacy of selexipag, an orally available, selective prostacyclin receptor (IP receptor) agonist, as a treatment for pulmonary arterial hypertension (PAH). 43 adult patients with symptomatic PAH (receiving stable endothelin receptor antagonist and/or a phosphodiesterase type-5 inhibitor therapy) were randomised three to one to receive either selexipag or placebo. Dosage was up-titrated in 200-g increments from 200 g twice daily on day 1 to the maximum tolerated dose by day 35 (maximum allowed dose of 800 g twice daily). Change in pulmonary vascular resistance at week 17 expressed as a percentage of the baseline value was the primary efficacy end-point, and was analysed in the per protocol set first and then in the all-treated set to assess robustness of results. A statistically significant 30.3% reduction in geometric mean pulmonary vascular resistance was observed after 17 weeks' treatment with selexipag compared with placebo (95% confidence limits -44.7- -12.2; p=0.0045, Wilcoxon rank sum test). This was supported by a similar result from the all-treated set. Selexipag was well tolerated with a safety profile in line with the expected pharmacological effect. Our results encourage the further investigation of selexipag for the treatment of PAH.

A: Selexipag is used for which disease?
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Q: The Raytown Branch of Mid-Continent Public Library is offering the following activities for the month of March. The library is located at 6131 Raytown Road. All activities are free, but registration is required. Tax Help for Seniors 10 a.m. Mondays and Wednesdays. AARP Tax-Aide representatives will be at the Library to assist seniors with medium to low incomes with tax questions and free tax return preparation. Time listed indicates starting time. Teen Games 2 p.m. March 2. Challenge yourself, challenge your friends. Movie Classics For adults, 2 p.m. March 4. Join us for an afternoon of nostalgia as we watch classic films. Call to see what's showing. KC Zoomobile Africa, for ages 5 and older, 11 a.m. March 5. Join the Kansas City Zoo for an African adventure. We will share African culture as well as show you an animal or two. Come with us to learn something new about Africa. Kids at the Library For ages 6 and older, 11 a.m. March 12. Discover, create, and play. Explore big ideas in a new way. Chess Free Play For ages 6 and older, 1 p.m. March 12. Play chess, learn the basics, brush up on your chess skills, challenge other players at Free Chess Play at the library. The Raytown Branch, in cooperation with the Raytown High School Chess Team coaches, will be hosting chess on the second Saturday of the month from 1 to 3 p.m. Chess boards and chess pieces will be provided. Eggstravaganza Noon March 26. Join us for story time with Mayor Mike McDonough, as we take part in Raytown's Easter festivities. After the stories, the Easter Bunny will escort the children across the street for an Easter egg hunt.

A:
Which activity is more likely to develop imagination and creativity?
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