The speed of a river varies from close to 0 m/s to 3.1 m/s (7 mph). Factors that affect the speed of a river include the slope gradient, the roughness of the channel, and tides. Rivers tend to flow from a higher elevation to a lower elevation.
Answer:
<h2>D. Joan of Arc</h2>
Explanation:
Joan of Arc was a French peasant who claimed she'd had visions of saints and an angel that told her to help restore France from domination by the English.
Joan of Arc came to the scene at a critical time in 1429. The northern half of France was essentially under the control of the English. There was contention over who was truly the French king after Charles VI had died in 1422. His son, the prince Charles, was a claimant to the throne. But the English contended their boy king, Henry VI, should rule over France.
In January 1429, Joan (age 17) came to the court of the prince, Charles, and convinced him of her mission from God. Within a few months, she had rallied the people of France and helped to break the control of the English over large sections of French territory. She ultimately was captured by a group of French nobles who were allied with the English, was handed over to the English, and was burned at the stake (in 1431). But she had done much to unite the French people around a sense of common patriotism and national aspirations.
A limiting factor is something in a ecosystem that limits the growth of a species. In this case, cowbirds are limiting factors to wood thrushes because they lay eggs in the nests of wood thrushes, which is called "nest parasitism." A decrease in the carrying capacity—the number of living organisms that a region can support (without environmental degradation)—of wood thrushes could be caused by a decrease in the insect population size. The less insects, the less food. With less resources, the carrying capacity will decrease for wood thrushes. If the cowbird population were decreased, or the space or number of nesting sites were increased, the carrying capacity would increase, instead.
Answer: B
