"Unidad" is a noun which is often translated as "unity", and "centena" is a noun which is often translated as "hundred". Learn more about the difference between "unidad" and "centena" below.
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A feminine noun is almost always used with feminine articles and adjectives (e.g. la mujer bonita, la luna llena).
Lean el primer párrafo en la Unidad 11 y respondan a las preguntas.Read the first paragraph in Unit 11 and answer the questions.
Han llevado al paciente a la unidad de cuidados intensivos.They've taken the patient to the intensive care unit.