Answer:
Radio-wave communications signals travel through the air in a straight line, reflect off of clouds or layers of the ionosphere, or are relayed by satellites in space. They are used in standard broadcast radio and television, shortwave radio, navigation and air-traffic control, cellular telephony, and even remote-controlled toys.
Explanation:
Answer: One by one, the Classic cities in the southern lowlands were abandoned, and by A.D. 900, Maya civilization in that region had collapsed. Finally, some catastrophic environmental change like an extremely long, intense period of drought–may have wiped out the Classic Maya civilization.
Explanation:
Answer: A. The abolitionist movement grew stronger.
<em>Dred Scott v. Sandford (1857)</em> was a landmark decision by the United States Supreme Court. It held that black people whose ancestors were imported into the U.S., whether enslaved of free, could not be American citizens. Therefore, they could not sue in federal court. Moreover, it ruled that the federal government had no power to regulate slavery in the territories acquired after the creation of the United States.
The decision was controversial, and greatly opposed by abolitionist groups. It strengthened the abolitionist movement and may have been a catalyst for the American Civil War.
The answer is B (Socialist).
It would not be Private Entrepreneurs and Capitalist since they support private control of production. Socialism on the other hand believes that production should be controlled by the workers themselves.
