What two eras ended with mass extinctions?

What two eras ended with mass extinctions? Both events were so significant they each marked the end of an era—the Mesozoic Era for the end-Cretaceous extinction and the Paleozoic Era for the end-Permian extinction. Which eras ended with a mass extinction apex? The Paleozoic Era ended with the largest extinction event in the history of […]

What 3 civilizations dominated Central and South America before European civilization?

What 3 civilizations dominated Central and South America before European civilization? A. The Maya, Inca, and Aztec peoples developed complex civilizations in Mexico, Central America, and Peru before the arrival of Christopher Columbus. They grew corn and many other food crops unknown in Europe. They developed their own calendars, mathematics, and engineering skills. Are Nicaraguans […]

Why do they do plea deals?

Why do they do plea deals? A plea bargain allows both parties to avoid a lengthy criminal trial and may allow criminal defendants to avoid the risk of conviction at trial on a more serious charge. In charge bargaining, defendants plead guilty to a less serious crime than the original charge that was filed against […]

Did Americans called a constitutional convention in 1787 to draw up a constitution and to create a stronger central government?

Did Americans called a constitutional convention in 1787 to draw up a constitution and to create a stronger central government? Library of Congress, Rare Book and Special Collections Division. The Constitutional Convention of 1787 was called to revise the ailing Articles of Confederation. However, the Convention soon abandoned the Articles, drafting a new Constitution with […]

What is serotonin and dopamine?

What is serotonin and dopamine? Dopamine and serotonin are chemical messengers, or neurotransmitters, that help regulate many bodily functions. They have roles in sleep and memory, as well as metabolism and emotional well-being. What is the difference between serotonin and dopamine? The main difference Dopamine system dysfunction is linked to certain symptoms of depression, such […]

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