I believe it would be proteins
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The phrase that best describes a meteoroid is "Small pieces of rock and dust in space"
Meteoroids are small bodies of the solar system. They are rocks between 100 μm -50 m in diameter that are smaller than comets and asteroids and bigger than cosmic dust. They commonly are fragments of comets and asteroids that had been separated from them by heavy impacts. When a meteoroid enters the atmosphere, it burns, and the glow that this burn produces is what we call "shooting stars". However, the correct definition is the mentioned above.
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E-coli bacteria which most useful in the routine monitoring of microbial pollution are gram negative rods and this is common indicator organism of water contamination.
It is important to identify enteric bacteria which is one of the major causes of diarrhea disease is bacteria and that detection of pathogenic bacteria is a global key to the prevention and identification of food borne diseases and enteric infections like diarrhea.
The extent of water contamination can be measured using these indicator organisms. This fecal coli-form group has been used as the most common indicator of general wastewater contamination because they are abundant and easy to identify.
To learn more about E-coli bacteria here
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The most appropriate answer is D !!
