Which of the following statements about surface waves is true?
1. surface waves are caused by winds.
2. surface waves can travel at 950 kilometers per hour.
3. surface waves are caused by underwater earthquakes.
4. surface waves have a longer wavelength than tsunami waves have.

Waves , or surface waves are most commonly caused by wind.  So your answer would be ,"  Surface waves are caused by winds . A

answer: - b cells

explanation: -

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.