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1 day ago · RNA world. A comparison of RNA ( left) with DNA ( right ), showing the helices and nucleobases each employs. The RNA world is a hypothetical stage in the evolutionary history of life on Earth, in which self-replicating RNA molecules proliferated before the evolution of DNA and proteins. [1] The term also refers to the hypothesis that posits the ...
1 day ago · Africa straddles the equator and the prime meridian. It is the only continent to stretch from the northern temperate to the southern temperate zones. [14] The majority of the continent and its countries are in the Northern Hemisphere, with a substantial portion and a number of countries in the Southern Hemisphere. Most of the continent lies in the tropics, except for a large part of Western ...
1 day ago · Literature is any collection of written work, but it is also used more narrowly for writings specifically considered to be an art form, especially novels, plays, and poems, [1] and including both print and digital writing. [2] In recent centuries, the definition has expanded to include oral literature, much of which has been transcribed. [3] [4] Literature is a method of recording, preserving ...
