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- Defining a species - Understanding Evolution
A species is often defined as a group of individuals that actually or potentially interbreed in nature In this sense, a species is the biggest gene pool possible under natural conditions For example, these happy face spiders look different, but since they can interbreed, they are considered the same species: Theridion grallator
- Scientists Revived Ancient Zombie Viruses Frozen For Eons . . .
The 48,500-year-old amoeba virus is actually one of 13 outlined in a new study currently in preprint, with nine of them thought to be tens of thousands of years old The researchers established that each one was distinct from all other known viruses in terms of their genome
- Why have humans evolved much more quickly than other animals?
Not only have all of our notable technological achievements occurred in the last couple hundreds years when human evolution was at its slowest (early human evolution as we know it today dates back at least 5-7 million years, and it was during this several million year period when all the genetic evolution you speak of happened), I would argue
- Last universal common ancestor - Wikipedia
Instead, by the time the LUCA lived, RNA viruses had probably already been out-competed by DNA viruses [73] LUCA might have been the ancestor to some viruses, as it might have had at least two descendants: LUCELLA, the Last Universal Cellular Ancestor, the ancestor to all cells, and the archaic virocell ancestor, the ancestor to large-to
- Exponential growth of bacteria: Constant multiplication . . .
The growth of a bacterial culture is one of the most familiar examples of exponential growth, with important consequences in biology and medicine Bacterial gro
- Scientists pull living microbes, possibly 100 million years . . .
The added nutrients woke up a variety of oxygen-using bacteria In samples from the 101 5-million-year-old layer, the microbes increased by four orders of magnitude to more than 1 million cells per cubic centimeter after 65 days, the team reports today in Nature Communications Others have found bacteria in oxygenated sediments under the sea floor
- Extinction Over Time - Smithsonian National Museum of Natural . . .
End of the Cretaceous (66 million years ago): Extinction of many species in both marine and terrestrial habitats including pterosaurs, mosasaurs and other marine reptiles, many insects, and all non-Avian dinosaurs The scientific consensus is that this mass extinction was caused by environmental consequences from the impact of a large asteroid
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