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QUICK ANSWER
"Quienes somos" is a form of "quienes somos", a phrase which is often translated as "who we are". "Quien" is a form of "quien", a pronoun which is often translated as "who". Learn more about the difference between "quienes somos" and "quien" below.
quienes somos()
A phrase is a group of words commonly used together (e.g., once upon a time).
a. who we are
Somos quienes somos, y eso no va a cambiar, pero podemos sacar el máximo partido de ello.We are who we are, and that's not going to change, but we can make the most of it.
quien()
A pronoun is a word that stands in for a noun (e.g., she).
1. (relative)
2. (indefinite)
a. anyone
Puedes elegir a quien quieras siempre y cuando levanten la mano.You can choose anyone you like as long as they raise their hand.