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Two species are described in the literature: A. ramidus, which lived about 4.4 million years ago [32] during the early Pliocene, and A. kadabba, dated to approximately 5.6 million years ago [33] (late Miocene). A. ramidus had a small brain, measuring between 300 and 350 cm 3.
The first known mass extinction was the Great Oxidation Event 2.4 billion years ago, which killed most of the planet's obligate anaerobes. Researchers have identified five other major extinction events in Earth's history, with estimated losses below: [ 11 ]
However, a 2012 study in Iceland of 78 children and their parents suggests a mutation rate of only 36 mutations per generation; this datum extends the separation between humans and chimpanzees to an earlier period greater than 7 million years ago . Additional research with 226 offspring of wild chimpanzee populations in eight locations suggests ...
Millennials or Generation Y: b. 1981-1996. Anyone born between 1981 and 1996, ... Gen Xers were often called the "Latchkey Generation" because many came home from school to empty houses, needing a ...
Perhaps as early as 1.5 million years ago, but certainly by 250,000 years ago, hominins began to use fire for heat and cooking. [ 14 ] Beginning about 500,000 years ago, Homo diversified into many new species of archaic humans such as the Neanderthals in Europe, the Denisovans in Siberia , and the diminutive H. floresiensis in Indonesia . [ 15 ]
Gen Alpha is the youngest generation to date, encompassing those born from 2011 to 2024. This generation is known for being digital natives, even more so than Gen Z, having been born into a world ...
This also marks the end of Generation Alpha, […] According to a blog post by Mark McCrindle, credited with helping define the past two generational labels, Generation Beta will be those born ...
One may then define the generation time as the time it takes for the population to increase by a factor of . For example, in microbiology , a population of cells undergoing exponential growth by mitosis replaces each cell by two daughter cells, so that R 0 = 2 {\displaystyle \textstyle R_{0}=2} and T {\displaystyle T} is the population doubling ...