Which is one characteristic shared by electromagnetic and mechanical waves? Both have a crest and a trough.
Both move due to particles bumping into each other.
Both are formed by charged particles.
Both occur as a result of a disturbance.

Which of these is an accurate and appropriate summary of paragraph 4? a) the speaker talks to her sister who understands politics. b) the speaker talks to her sister about all of her problems. c) the speaker wants her sister to tell her which party is best. d) the speaker is trying to find out who her sister is voting for.

True or false. mucous membranes secrete mucus that traps pathogens.

There is only one copy machine at your office. you have to make 1000 copies of an expense report. after you begin copying, two other employees show up in the copy room. each has to make only 10 copies each. what is the proper etiquette in this situation?