The picture shows what Maria sees in observing onion cells. The table to the right shows what each O. U. measures in micron. The objective lens she uses is 10x.
Calculate the width of the onion cell at the tip of the pointer in um.

   123.5 μm

If it served you, give me 5 stars please, thank you!

(a) Total power of magnification 100x because ocular lens is 10x magnification maultiplied by 10x objective lens.

(b) Widht of the onion cell can be calculated as follows:

If the number of units observed for an onion cell through ocular micrometer (10x) under microscope is 'A'.

Then, the widht of the cell will become = A X 9.5 (Calibration factor of ocular unit and total power fo magnification is 100x)

So, for example if the observation through ocular micrometer is 13, then the widht of the onion cell will be = 13 X 9.5 = 123.5 μm

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]

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.