The Fifteenth Amendment to the US Constitution guarantees that no citizen will be denied the right to vote based upon their "race, color, or previous position of servitude." The Amendment was ratified on February 3, 1870 and was the third and final Reconstruction Amendment. This amendment was a major amendment in advancing racial equality in the United States in that it guaranteed African Americans the right to vote. However, it would continue to take years before the spirit of this law was fully implemented and continues to be challenged today in the courts.
The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
The constitutional power that Congress has over the bureaucracy is that the United States Congress can exert control over the bureaucracy by overseeing and supervising the public funds that allow its operation. So Congress can control the funds the government offices need to operate and the members of Congress can approve the appointments of the President to the cabinet and other public offices. Congress forms committees to evaluate the necessities of the US bureaucracy and many times hold hearings with the heads of government departments to make sure the funds are justified.
Answer:
C. Varieties of an element that differ only in the number of neutrons are called isotopes.
Explanation:
The Earth is approximately 
old. The solar system formed from giant gas clouds which was a part of the solar nebula.
The surface of soil which demarcates two soils of different geological ages is called a unconformity.
Palesol is the soil that lies between sediments or volcanic deposits. If the paleosol is older they have lithified rock.
Hence, option C is true.
Before farming, people hunted animals and gathered plants (such as berries) for food: they're called hunter-gatherers.
They lived in whatever provided shelter: caves were a good candidate, but also huts made from whatver was available (mud, bamboo, wood, etc.).
