14. Many researchers believe that IQ has a reaction range, which refers to the limits imposed on IQ by heredity. The IQ that a person can achieve is limited by hereditary factors, which set an upper and lower limit. The environment determines where a person's IQ falls within these
ranges.
15. Fluid and crystallized intelligence change over time, with different mental abilities peaking at different times. Fluid intelligence has long been thought to peak in childhood, but new research published in 2015 suggests that some aspects of fluid intelligence may peak as late as age 40.
African Americans because even though they gained their freedom in the 1800s, they weren't allowed to vote until the early mid 1900s. Things like Jim Crow laws and literacy tests prevented them from voting until those were lifted. <span />
<u>Answer:</u>
"Separate but equal" best describes the official status of African Americans in the United States during World War I.
<u>Explanation:</u>
The supreme court of United States permitted states to segregate people of color by applying earlier laws on civil rights, when African Americans knocked at supreme court to protect their rights under the constitution.
A new Louisiana law in 1890 needed railroads to give "equal but separate accommodations on the basis of colored races" this blasted the New Orleans' black community therefore "Plessy v. Ferguson" case got stand and decision of supreme court came as "separate but equals". Plessy is commonly refereed as one of the worst decisions in the U.S. History of the Supreme Court. Later series of decisions came which overruled the "separate but equal" as found unconstitutional like "1954 case Brown v. Board of Education".
