Answer:
I think is D I'm sorry if I'm wrong
That's the definition of the PERIOD of the vibration.
It's exactly the reciprocal of the vibration's frequency.
Chloroplast...................
A windmill produces wind without electricity. wind blows on a windmill and it and that’s how it produces wind. You can put a windmill in anywhere outdoors (ex. Deserts or plains)
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Hope this helped you:)
