Compare and contrast the structures of plant and animal cells.

Plant and animal cells are very similar when it comes to their structures for the reason that they are both eukaryotic cells. Both plant and animal cells have membrane-bound organelles such as the mitochondria, nucleus, golgi apparatus, endoplasmic reticulum, peroxisomes and lysosomes. They also both have similar cytosol, membranes, and cytoskeletal elements.  However, the few differences that exist between plant and animals are very substantial and show a significant difference in the functions of each cell.

One of the major differences between the two is that, plant cells can be larger than animal cells. The standard range for an animal cell differs from 10 to 30 micrometers whereas that for a plant cell varies from 10 to 100 micrometers. Aside from size, the key structural differences between plant and animal cells lie in a few additional structures found in plant cells. The said structures comprise of the cell wall, vacuoles, and chloroplasts. On the contrary, in animal cells, the mitochondria produces the majority of the cells energy from food and it does not have the same purpose in plant cells. Plant cells use sunlight as their source of energy, then the sunlight will turn into energy inside the cell in a process called photosynthesis; and chloroplasts are the structures that complete this task.  

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]

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.