What is different about the way the genus and species names are written compared to the other taxa?

The way genus and species name are written are different from other taxa as both the genus and species name should be in italics and the first letter of genus name should be in capital and other letters should be in small and the species name should also be in small letters.

This rule is called binomial nomenclature and this rule does not follow to other taxa of the hierarchy so they are not italicized. This rule avoid confusion generated by common names by giving them a scientific name which is same and unique in every part of world.  

Example: Panthera leo is scientific name of lion.

hey bro i looked it up on google the structure of the eye-spot in euglena viridie, e. ehrenbergii, and phacus pyriyorme is not as franzé haa described it. the so-called “crystal body” and “lens bodies” were not found in any of the individuals of the species examined by me. as earlier observers have stated, the eye-spot consists simply of a mass of pigment granules arranged in a single layer, and probably embedded in a protoplasmic framework, but the latter could not be seen, and its presence was only inferred from the fact that the pigment granules must be held together in some way, thd the eye-spot as a whole is capable of expansion, and that the pigment granules can be separated from each other.

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well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."