The apical portion of intestinal cells is conjugated via this cellular structure.

The intestines are two organs of the Gastrointestinal tract whose main function is to carry out the digesting and absorption, as well as expulsion of waste, in the body. In order to carry out these functions, intestines are not just covered with a muscular lining, but also with different types of epithelial cells that form the lumen, or the interior, of the organs. These cells have diverse functions, but probably two of the most important are: the production of mucus, and the capacity to absorb and carry into the bloodstream, different nutrients present in food. One final job is to also help push waste products and water until this exits as fecal matter.

The intestinal cells are: enterocytes, goblet cells, enteroendocrine cells, paneth cells, microfold cells, cup and tuft cells. All of these form from stem cells at the crypts inside the intestinal structure and one of the most amazing features of two of them: enterocytes and goblet cells is that both have at their apical surface, microvilli, hair-like extensions that increase the surface of the intestine to increase absorption capacity. It is this feature that is common between these two of the most common of the intestinal cells. However, while enterocytes are exclusively dedicated to absorption, goblet cells also have the capacity of producing mucus, a fluid that covers the intestinal lumen and facilitates the functions of the intestines.

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a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]