Urgent answer jesi is on vacation and visited a seafood restaurant to eat a shrimp dinner. about thirty minutes after eating, she begins to feel ill and her stomach is rumbling. shortly after, she begins to vomit. jesi's body is experiencing a reaction to an stimulus. internal response external biological clock during a stressful or threatening situation, which of the following is the best description of how the nervous systems in your body would respond? the parasympathetic nervous system releases adrenaline and the sympathetic nervous systems calms the system back down. the parasympathetic nervous system senses the danger and the sympathetic nervous system responds by releasing adrenaline . the parasympathetic nervous system brings the system back to normal after the sympathetic nervous systems signals to release adrenaline. which of the following scenarios is the best example of positive feedback? as blood pressure decreases, your heart rate increases. as blood pressure greatly decreases, blood flow decreases, and blood pressure drops more. as body temperature rises, you begin to sweat. as body temperature decreases, your body begins to shiver.

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]