Basic Guidelines For English Spellings
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(forming nouns) denoting arts or sciences, branches of study, or profession.
A noun ending in -ics meaning ‘a subject of study or branch of knowledge’ will usually take a singular rather than a plural verb: politics is a blood sport classics is hardly studied at all these days. However, the same word may take a plural verb in cases where the sense is plural: many of the classics were once regarded with disdain
From French -iques, Latin -ica, or Greek -ika, plural forms.