Parallelism means giving two or more parts of one or more sentences a similar form to create a definite pattern, a concept and method closely related to the grammatical idea of parallel construction or structure, which can also be called parallelism.
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Ocean currents can be caused by wind, density differences in water masses caused by temperature and salinity variations, gravity, and events such as earthquakes or storms.
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<h2><u>Sanitation refers to public health conditions related to clean drinking water and adequate treatment and disposal of human excreta and sewage.[1] Preventing human contact with feces is part of sanitation, as is hand washing with soap. Sanitation systems aim to protect human health by providing a clean environment that will stop the transmission of disease, especially through the fecal–oral route.[2] For example, diarrhea, a main cause of malnutrition and stunted growth in children, can be reduced through adequate sanitation.[3] There are many other diseases which are easily transmitted in communities that have low levels of sanitation, such as ascariasis (a type of intestinal worm infection or helminthiasis), cholera, hepatitis, polio, schistosomiasis, and trachoma, to name just a few.</u></h2>
The last one because it make the most sense
