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Há 1 dia · The validity of several tiger subspecies was questioned in 1999 as most putative subspecies were distinguished on the basis of fur length and colouration, striping patterns and body size of specimens in natural history museum collections; since fur characteristics vary widely within populations, it was proposed to recognise only two tiger subspecies as valid, namely P. t. tigris in mainland ...
Há 1 dia · Johann Carl Friedrich Gauss (German: Gauß [kaʁl ˈfʁiːdʁɪç ˈɡaʊs] ⓘ; [2] [3] Latin: Carolus Fridericus Gauss; 30 April 1777 – 23 February 1855) was a German mathematician, astronomer, geodesist, and physicist who contributed to many fields in mathematics and science. He ranks among history's most influential mathematicians and has ...
Há 1 dia · 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 ...
Há 1 dia · t. e. Space exploration, as predicted in August 1958 by the science fiction magazine Imagination. Science fiction (sometimes shortened to SF or sci-fi) is a genre of speculative fiction, which typically deals with imaginative and futuristic concepts such as advanced science and technology, space exploration, time travel, parallel universes, and ...
