1 is false, waves can't propagate in a vacuum.
Just reread the text I'm sure you can find it in there. You are probably over thinking it. I know this isn't the awnsr you wanted bit you should do a bother activity to clear your mind and try again later☺
Answer:
<em>The speaker's official role is to moderate debate, make rulings on procedure, announce the results of votes, and the like. The speaker decides who may speak and has the powers to discipline members who break the procedures of the chamber or house.</em>
Explanation:
<h3>I hope this helps!!</h3>
Answer:
Kwame Nkrumah
Explanation:
Kwame Nkrumah PC (21 September 1909 – 27 April 1972) was a Ghanaian politician and revolutionary. He was the first Prime Minister and President of Ghana, having led the Gold Coast to independence from Britain in 1957.