Answer: (A) Surveys are generally cheaper to conduct.
Explanation:
Both surveys and experiments are valid means to scientifically establish data about groups of people and how the way specific variables influence them. A survey examines the way a variable we have no control over has affected, for example, a group of people. In an experiment, one of the variables is manipulated while the other one is measured.
Surveys are comparatively inexpensive, especially if they are online surveys, and even if incentives are provided to participants.
Answer:
Foreign invaders brought them there as captives.
Explanation:
your welcome
There must be an earthquake detector in place to detect any earthquakes off the shores in the oceans. This system can be a regional or local system, and although the system is fallible the margin of error is very small.
Sometimes though the earth quake/movement is too close to shore to detect it in time, and people get caught in it as a result.
There also needs to be a universal warning signal that actually tells people that the tsunami is coming.
I hope this helped.
The correct answer is D. Specific knowledge is excludable, while general knowledge is not excludable.
Explanation:
General knowledge refers to information, facts, etc. that are basic, and due to this, they are known by most of the people. Indeed, general knowledge is obtained through basic education, interaction with others and exposition to media. Moreover, general knowledge covers multiple areas. On the other hand, specific knowledge focuses on specific areas and covers complex facts, information, etc. Also, in most cases, specific knowledge can only be acquired through formal training or education.
Besides, in terms of excludability (quality of a service or product that needs to be paid to be acquired), specific knowledge is mainly excludable because people who do not pay for formal training cannot obtain it. On the opposite, general knowledge is not excludable as this can be obtained for free, and therefore it is not possible to control this (Option D).
