A higher frequency. I just got this answer on usa test prep.
Sound Waves will be an example of mechanical waves.. hope this helps!
Answer:


Explanation:
See attachment for complete work.
The answer is 3
I hope I helped
Answer:
<em><u>number</u></em><em><u> </u></em><em><u>d</u></em>
Explanation:
<em><u>because</u></em><em><u> </u></em><em><u>plant</u></em><em><u> </u></em><em><u>need</u></em><em><u> </u></em><em><u>carbondioxide</u></em>