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Allows us to compare the value of goods and services
Answer: Railroad expansion affected the US economy by creating jobs, establishing a national market, establishing a cattle industry on the Plains, and allowing certain people to acquire great wealth through investing in the railroad.
Explanation:
Answer: Construct Validity
Explanation:
Construct Validity is a measure of how well a test is structured to examine the fact or event we actually want to measure. Put simply, do the variables we are trying to measure and labels we assign them reflect the idea that we intend?
In this question, the threat to construct validity is that black/white does not refer to race but social status due to the culture where the terms are used. The labels used here will translate into a test that measures a completely different idea, and will also generate different results from what is intended.
Answer:
It was most likely a different climate millions of years ago when those fossils were created hope this helps :)
