Andrew Johnson was the president who signed the treaty to purchase Alaska from Russia on March 30, 1867.
Phoenix
The comparison is the capitals of each state
Answer:
D: more land is being farmed
Explanation:
This is the same thing as over farming.
Irrigation systems are used to work the entire day with no stop, using so much water and allows water to be over used. Many farms now use irrigation systems. You have to think about where the answer D goes to: more farms = more water usage for plants, crops, utilities, animals.
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People living in the 21st century have a better life quality than people who lived in previous times. The statement comes with two different views, reasons for which can be stated. Though most of us can agree with the statement.
The 21st century can be a great time to live in because of the great advancements in science and technology which have paved new ways for people as well as for the world at large, to come up with new and innovative discoveries as well as inventions. This could eventually reduce the number of problems people may have been facing earlier.
The statement can be disagreed with as well because with the advancements coming up, the quality of life is decreasing since man is becoming more and more dependent on technology. Moreover, the environment too is being impacted to a great extent.
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Independent variable
To achieve internal validity, a researcher must design and conduct experiments where only the independent variable can be the cause of the results.
<h3>What are internal and external validity?</h3>
The degree to which a study shows a reliable cause-and-effect relationship between a therapy and a result is known as internal validity. Internal validity also shows that a particular investigation enables the exclusion of competing hypotheses for a finding. Internal validity is not a binary term, either yes or no. Instead, we evaluate how confident we can be in a study's conclusions depending on whether it avoids pitfalls that could cast doubt on the results.
The term external validity describes how effectively the results of a study should be extrapolated to other contexts. In other words, the generalizability of the results is the subject of this form of validity. For instance, are the results generalizable to different populations, environments, circumstances, and eras? Transferability is a different word that describes external validity and a qualitative research design. Whether results apply other circumstances with similar characteristics is referred to as transferability.
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