Ques & Ans: The three major constituents of air, and therefore of Earth's atmosphere, are nitrogen, oxygen, and argon. Water vapor accounts for roughly 0.25 % of the atmosphere by mass. The concentration of water vapor (a greenhouse gas) varies significantly from around 10 ppm by volume in the coldest portions of the atmosphere to as much as 5 % by volume in hot, humid air masses, and concentrations of other atmospheric gases are typically quoted in terms of dry air (without water vapor). The remaining gases are often referred to as trace gases, among which are the greenhouse gases, principally carbon dioxide, methane, nitrous oxide, and ozone. Filtered air includes trace amounts of many other chemical compounds. Many substances of natural origin may be present in locally and seasonally variable small amounts as aerosols in an unfiltered air sample, including dust of mineral and organic composition, pollen and spores, sea spray, and volcanic ash. Various industrial pollutants also may be present as gases or aerosols, such as chlorine (elemental or in compounds), fluorine compounds and elemental mercury vapor. Sulfur compounds such as hydrogen sulfide and sulfur dioxide (SO) may be derived from natural sources or from industrial air pollution.

Answer this question based on the passage: what are the main components of earth's atmosphere?
nitrogen , oxygen , and argon

Stream of consciousness: This is the relevant information: The three major constituents of air, and therefore of Earth's atmosphere, are nitrogen, oxygen, and argon.

Ques & Ans: Harvey was born in Cincinnati, Ohio. She had hearing problems and underwent several surgeries as a child to try to correct them. Her family moved to Colorado when she was a young child. She sang throughout her childhood and her talent was recognized at Longmont High School, where she graduated in 2006. Harvey gradually lost her hearing as a result of the connective tissues disorder Ehlers-Danlos syndrome. She lost her remaining hearing when she was nineteen, while she was majoring in vocal music education at Colorado State University; as a result she left the university.

How did the girl on americas got talent lose her hearing?
the connective tissues disorder Ehlers - Danlos syndrome

Stream of consciousness: The relevant sentence in the passage is: Harvey gradually lost her hearing as a result of the connective tissues disorder Ehlers-Danlos syndrome.

Ques & Ans: Context: In humans, mature red blood cells are flexible and oval biconcave disks. They lack a cell nucleus and most organelles, in order to accommodate maximum space for hemoglobin; they can be viewed as sacks of hemoglobin, with a plasma membrane as the sack. Approximately 2.4 million new erythrocytes are produced per second in human adults. The cells develop in the bone marrow and circulate for about 100 -- 120 days in the body before their components are recycled by macrophages. Each circulation takes about 60 seconds (one minute). Approximately a quarter of the cells in the human body are red blood cells. Nearly half of the blood's volume (40 % to 45 %) is red blood cells.

Question: where does red blood cell formation occur in adults?
in the bone marrow

Stream of consciousness:
To answer the question, consider the following: The cells develop in the bone marrow and circulate for about 100 -- 120 days in the body before their components are recycled by macrophages.