<span>Depending on the specifics of the culture, the gesture of a smile might not be recognized by tribe members. The bearing of teeth as done when one smiles, might be seen as an aggressive maneuver as seen in the animal kingdom.</span>
Positive reinforcement. Because he leaves before everyone else
Answer:
The improvement on road network and consequent industrialization in cities led to increase in urbanization.
Explanation:
By the beginning of the 18th century, less than 10 percent of the population of the world were found in cities. When the industrial era set in, cities began to grow at a faster rate and they became a hub for population and industrial productions.
The United Sates of America oversaw the construction of railroads that ultimately led to the reduction of transportation costs on goods and more production centers began to spring up in the country
Free blacks in the antebellum period—those years from the formation of the Union until the Civil War—were quite outspoken about the injustice of slavery. Their ability to express themselves, however, was determined by whether they lived in the North or the South. Free Southern blacks continued to live under the shadow of slavery, unable to travel or assemble as freely as those in the North. It was also more difficult for them to organize and sustain churches, schools, or fraternal orders such as the Masons.
Although their lives were circumscribed by numerous discriminatory laws even in the colonial period, freed African Americans, especially in the North, were active participants in American society. Black men enlisted as soldiers and fought in the American Revolution and the War of 1812. Some owned land, homes, businesses, and paid taxes. In some Northern cities, for brief periods of time, black property owners voted. A very small number of free blacks owned slaves. The slaves that most free blacks purchased were relatives whom they later manumitted. A few free blacks also owned slave holding plantations in Louisiana, Virginia, and South Carolina.
Free African American Christians founded their own churches which became the hub of the economic, social, and intellectual lives of blacks in many areas of the fledgling nation. Blacks were also outspoken in print. Freedom's Journal, the first black-owned newspaper
The answer is B. Incentive is the term being described
