It pollutes the air and can get people killed by cave in's.
The answer is: " 8 (eight) " .
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Answer:
Cross-sectional research method
Explanation:
The Cross-sectional research method is a method of observational study design. Here, in this study the experimenter or the researcher measures and studies the outcome and and exposures in the study participants in the same time.
In the context, An experimenter studies the heredity and the intelligence of the MZ twins who are reared together and for those who are reared apart. The findings of the experiment made by the researcher is a result of a cross sectional research method in this case.
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Answer: When individuals and businesses are permitted to trade freely over a larger market area, they are able to produce a higher quantity of output and bring in different products.
Explanation: When businesses and individuals trade with one another, they are able to receive more items that they may not have been able to produce themselves. Trading freely allows for more people to have the opportunity to use other products that they can't make in their own country/state.
