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"Morena" is a form of "morena", a noun which is often translated as "moray eel". "Soy baja" is a phrase which is often translated as "I'm short". Learn more about the difference between "morena" and "soy baja" below.
la morena()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
soy baja()
A phrase is a group of words commonly used together (e.g., once upon a time).