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The timeline of human evolution outlines the major events in the evolutionary lineage of the modern human species, Homo sapiens, throughout the history of life, beginning some 4 billion years ago down to recent evolution within H. sapiens during and since the Last Glacial Period . It includes brief explanations of the various taxonomic ranks in ...
Cultural-historical activity theory ( CHAT) [ 1] is a theoretical framework [ 2] which helps to understand and analyse the relationship between the human mind (what people think and feel) and activity (what people do). [ 3][ 4][ 5] It traces its origins to the founders [ 6] of the cultural-historical school of Russian psychology L. S. Vygotsky ...
Society portal. v. t. e. Human impact on the environment (or anthropogenic environmental impact) refers to changes to biophysical environments [ 1] and to ecosystems, biodiversity, and natural resources [ 2] caused directly or indirectly by humans. Modifying the environment to fit the needs of society (as in the built environment) is causing ...
Deforestation in the Maranhão state, Brazil, in July 2016. The Amazon rainforest, spanning an area of 3,000,000 km 2 (1,200,000 sq mi), is the world's largest rainforest. It encompasses the largest and most biodiverse tropical rainforest on the planet, representing over half of all rainforests. The Amazon region includes the territories of ...
New data from the Department of Labor showed nearly 1.84 million claims were filed in the week ending June 22, up from 1.82 million the week prior. Meanwhile, the 4-week moving average of weekly ...
Conception. Studies report that three primary structures are formed in the sixth gestational week. These are the forebrain, the midbrain, and the hindbrain, also known as the prosencephalon, mesencephalon, and the rhombencephalon respectively. Five secondary structures originate from these in the seventh gestational week.
SAF, an umbrella term for a wide range of low-carbon fuels for airplanes, is an obvious opportunity. The fuel is proven, can power existing aircraft, and, if adopted widely, could reduce aviation ...
Human extinction is the hypothetical end of the human species, either by population decline due to extraneous natural causes, such as an asteroid impact or large-scale volcanism, or via anthropogenic destruction (self-extinction), for example by sub-replacement fertility.