project in charge of studying the Las Hoyas deposit, explains that “the potential importance of microbial mats in the formation of fossils is evident. They not only seem to intervene in the delay of the decomposition of the bodies, but also in the mineralization processes. Given the complexity at all levels that this microbial community presents, the processes that give rise to the formation of a fossil could be very diverse ”. Finally, the authors highlight the need to continue with very long-term experimentation, and compare it with the fossil record to determine the real impact of this community of microorganisms in those deposits where they could be present at the time of their formation.What is it that makes us properly human? This is the starting point for the next

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edition of B · Debate, directed by Jaume Bertranpetit and Elena Nepal WhatsApp Number List Bosch, both principal researchers at the Institute of Evolutionary Biology ( IBE , UPF-CSIC). On July 17 and 18, high-level international researchers will meet at the Palau Macaya to try to understand the genetic bases of our uniqueness as human beings and the difference between large groups of populations. There are characteristics that are typical of the human species. Some are language, cognitive abilities and the fact of walking upright. But what biological keys are hidden behind these characteristics of human beings? All the distinctive elements of our species are due to genes that have been enhanced by natural selection for thousands of years. For example, humans and

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chimpanzees share 99% of the directly comparable or alignable part of the genome. Although 1% may seem small, this percentage translates into a minimum of 30 million genetic differences between one species and another, and this implies a very broad field of scientific study. Even between one human and another there are 3 million differences on a genetic basis. The genetic alterations that make us human Modern humans appeared about 200,000 years ago in Africa, from where they spread 100,000 years ago in different areas around the planet, from tropical regions to high altitude places where they have adapted over thousands of years. Scientists have described several evolutionary adaptations that define us as a species. Why are there populations that, despite living in regions located at high altitudes, survive with less oxygen? The explanation is found in a

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