They show the most important substances as it can show how they reac in a chemical and how they are able to react
Plessy v. Ferguson, 163 U.S. 537 (1896), was a landmark decision of the U.S. Supreme Court that upheld the constitutionality of racial segregation laws for public facilities as long as the segregated facilities were equal in quality – a doctrine that came to be known as "separate but equal".
Answer:
Harry Harlow
Explanation:
Contact comfort refers to the intimate care that the mothers give to their infants (including hugs, feeding, spending time playing with the infants , etc)
According to harlow, infant primates (including humans) will receive a deep sense of comfort and protection from such behavior that will benefit their mental health in the future. If they did not receive it, they tend to seek this missing care from other people when they are grown up in a more unhealthy ways.
Answer:
The Market Revolution
The Market Revolution of the nineteenth century radically shifted commerce as well as the way of life for most Americans.
Explanation:
The Market Revolution (1793–1909) in the United States was a drastic change in the manual-labor system originating in the South (and soon moving to the North) and later spreading to the entire world. Traditional commerce was made obsolete by improvements in transportation, communication, and industry. With the growth of large-scale domestic manufacturing, trade within the United States increased, and dependence on foreign imports declined. The dramatic changes in labor and production at this time included a great increase in wage labor. The agricultural explosion in the South and West and the textile boom in the North strengthened the economy in complementary ways.
