Ques & Ans: By volume, dry air contains 78.09 % nitrogen, 20.95 % oxygen, 0.93 % argon, 0.04 % carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1 % at sea level, and 0.4 % over the entire atmosphere. Air content and atmospheric pressure vary at different layers, and air suitable for use in photosynthesis by terrestrial plants and breathing of terrestrial animals is found only in Earth's troposphere and in artificial atmospheres.

Answer this question based on the passage: what is the percentage of o2 in air?
20.95 %

Stream of consciousness: To answer the above question, the relevant sentence is: By volume, dry air contains 78.09 % nitrogen, 20.95 % oxygen, 0.93 % argon, 0.04 % carbon dioxide, and small amounts of other gases.

Ques & Ans: Context: Conservation refers to a logical thinking ability which, according to the psychologist Jean Piaget, is not present in children during the preoperational stage of their development at ages 2 -- 7, but develops in the concrete operational stage at ages 7 -- 11. Conservation refers to the ability to determine that a certain quantity will remain the same despite adjustment of the container, shape, or apparent size.

Question: in which stage of cognitive development does the conservation concept first appear?
the concrete operational stage at ages 7 -- 11

Stream of consciousness: To answer this question, we should know that: Conservation refers to a logical thinking ability which, according to the psychologist Jean Piaget, is not present in children during the preoperational stage of their development at ages 2 -- 7, but develops in the concrete operational stage at ages 7 -- 11.

Ques & Ans: "Fly Me to the Moon", originally titled "In Other Words", is a song written in 1954 by Bart Howard. Kaye Ballard made the first recording of the song the year it was written. Since then, it has become a frequently recorded jazz standard often featured in popular culture; Frank Sinatra's 1964 version was closely associated with the Apollo missions to the Moon, and the Japanese animated series Neon Genesis Evangelion played the song at the end of each episode.

When was the song fly me to the moon written?
1954

Stream of consciousness:
To answer this question, we should know that: "Fly Me to the Moon", originally titled "In Other Words", is a song written in 1954 by Bart Howard.