>>214519445
Depends on each country, but to answer your question, no, most aren't ethnically Arab; most are Arabophone, according to linguists at least.
Since the modern sociolinguistic identity we call "Arab" revolves principally around being a speaker of Arabic, then most assume as such.
Most "Arabs" aren't ethnically Arab. Some partially lost their original identity through state Arabization efforts, some through historical and geographical proximity such as the Levant, and more. Also, the concentration of this depends on the country.
Since our supposed Arabization is very recent, we have the most clear Berber heritage and a decent chunk of the population that speaks the languages either as a first or second language.
But in terms of customs and culture, we pretty much have zero things in common with actual Arabs, except Islam, and even our rendition of Islam is different in certain aspects, it's mostly just a linguistic shift for us.