1 is false, waves can't propagate in a vacuum.
Answer:
self-administered survey
Explanation:
Jackie is doing a study on the number of hours spent watching TV and how this affects family cohesion. She decides to mail a questionnaire to randomly selected households in her state. This is an example of <u>self-administered survey</u>. A self-administered survey is a survey that is done or designed in such a way that the researcher will not interfere with the respondents. In this method the respondents complete the survey on their own with no agent to guide or interfere in the process. While this method is relatively cheap, the respondents feel more at ease, there is a higher requirement of respondents because due to the absence of monitoring or guidance there is usually increased error in questionnaires.
Answer:
Crusades affected Medieval Europe in various ways. One of them was to spread trade and knowledge in Europe.
Explanation:
This is what helped the European economy get strong while the feudalism was being destroyed. Crusades were organized by Christians from West Europe after centuries of wars for spreading Islam. The purpose of crusades was to stop the expansion of Muslim countries, the return of Christianity and territories that once belonged to the Christians.
Answer:
dont know spanish srry hablo espenoal
Explanation:
