Explanation:
For example, “the old house” is a noun phrase. It is a phrase that describes and presents the noun “house.” “Fell down slowly” is a verb phrase, because it describes and presents the past tense verb “fell.” There are other phrases too, such as prepositional phrases, adjective phrases, and so on

The harmonic frequency refers to the resonant frequency that is an integral multiple of the fundamental frequency, harmonics are usually simple sinusoidal oscillation at a single frequency. where as Resonance frequency are frequencies that are not necessarily sinosudal or integral multiple of fundamental frequency and it may have complex oscillations made up of multiple harmonics ~
It's like if you play a piano with a single key, it will show harmonic frequency, but if you use multiple keys at a time it may show Resonance.
Answer and Explanation:
The context clues allowed me to understand that the word "adopt" had the meaning of "use". This conclusion can be drawn, because the context shows that several authors were inspired by the work "The legend of Arthur" to create their stories. In this way, we can contextualize that these inspirations caused these authors to use original terms from "The legend of Arthur" in the works they wrote, thus allowing them to "adopt" these terms, that is, they used terms that had not been generated by they.