The answer would be sound waves.
Hope this helps!
Religious and political conflicts diminished
The conjugation of the verb "design" to "designed", without any auxiliary verb such as "have" or "do", shows the use of the 'simple past" tense (also known as preterite), whose principal function is to place a completed action or situation in a moment before "now".
What tense is the underlined verb in the sentence? The architect designed a daring structure.
D. Past
Please help i will give you 90 points: How did Susan B. Anthony affect the women's suffrage movement?
She served as president of the the National Women's Suffrage Association.
She started a feminist newspaper that focused on abolition.
She was a traveling African American preacher who made speeches about abolition and women's suffrage.
She created the National Women's Party, which was known for bold protests.
segrogation. "The 1920s was a decade of change, when many Americans owned cars, radios, and .... Yet segregation, or separation of the races, continued to be practiced in North ... Modern civil rights laws for minorities were still many years away."- NC Pedia