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Homochirality is an obvious characteristic of life on Earth, yet extraterrestrial samples contain largely racemic compounds. [7] It is not known whether homochirality existed before life, whether the building blocks of life must have this particular chirality, or whether life must be homochiral at all.
The novel grew out of a short story, "Intergalactic P.S. 3", first published as a pamphlet for Children's Book Week in 1970. In this early version of the narrative, Mrs Whatsit, Mrs Who and Mrs Which from A Wrinkle in Time send Charles Wallace, Meg and Calvin to a school on another planet, where Proginoskes and a conifer seed version of Sporos are among their classmates.
When the model becomes accurate, it is just as difficult to understand as the real-world processes it represents. Buttered cat paradox: Humorous example of a paradox from contradicting proverbs. Intentionally blank page: Many documents contain pages on which the text "This page intentionally left blank" is printed, thereby making the page not ...
In biology, a ring species is a connected series of neighbouring populations, each of which interbreeds with closely sited related populations, but for which there exist at least two "end populations" in the series, which are too distantly related to interbreed, though there is a potential gene flow between each "linked" population and the next ...
In biology, a biological life cycle (or just life cycle when the biological context is clear) is a series of stages of the life of an organism, that begins as a zygote, often in an egg, and concludes as an adult that reproduces, producing an offspring in the form of a new zygote which then itself goes through the same series of stages, the ...
For example, the mammals of Europe, Africa, and upper North America [a] are in class Mammalia, legion Cladotheria, sublegion Zatheria, infralegion Tribosphenida, subclass Theria, clade Eutheria, clade Placentalia – but only Mammalia and Theria are in the table. Legitimate arguments might arise if the commonly used clades Eutheria and ...
This year his completion percentage is down (from 69.0 to 66.7) while his interceptions are up (from 6 to 9). The mock drafts have him anywhere from the end of the first to a third-day selection.
The pygmy mammoth is an example of insular dwarfism, a case of Foster's rule, its unusually small body size an adaptation to the limited resources of its island home.. A biological rule or biological law is a generalized law, principle, or rule of thumb formulated to describe patterns observed in living organisms.