<span>The Sputnik 1 was the first man made artificial satellite launched by the Soviet Union to orbit the earth. Sputnik 1 was a </span><span>polished metal orb, with four external radio antennas to broadcast radio pulses.</span>The launch by the Soviet Union triggered the Cold War between the United States and the Soviet Union.
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Explanation:
Charles Darwin & Alfred Russel Wallace. A visit to the Galapagos Islands in 1835 helped Darwin formulate his ideas on natural selection. He found several species of finch adapted to different environmental niches. The finches also differed in beak shape, food source, and how food was captured. Natural selection is the mechanism suggested by Darwin for evolution. Because resources are limited in nature, organisms with heritable characteristics that favor survival and reproduction leave more offspring than their peers, causing the traits to become more common over generations.
<span>The Cold War was a nearly 50-year long period of tense relations between the United States and the Communist-ruled Soviet Union. The Cold War began almost immediately after World War II and ended with the 1991 dismantling of the Berlin Wall and the dissolution of the Union of Soviet Socialist Republics. The fear of Communism infiltration in the U.S. government, entertainment industry and other organizations affected American politics, culture, and even daily life, particularly in the early years of the Cold War.</span>
TRUE
The theory of island biogeography was proposed in the 1960s by ecologists Robert MacArthur and Edward Wilson to explain the richness of species on islands.
This theory has as main idea to base the relation wealth of species by area, that had been discussed by many biologists at that time. MacArthur and Wilson believed that in isolated environments such as oceanic islands, species richness is determined by a balance between immigration and emigration, but immigration and emigration rates vary by island size and distance to the continent.
<u>Currently, the theory is applied not only to oceanic islands, but also to any habitat that is isolated by an environment unsuited to the present species, such as insular lakes, </u><u>caves</u><u>, mountain peaks isolated by plains, forest fragments isolated by deforested areas.</u>
<span>In 1867 their was two laws passed: First, Tenure of Office Act which forbade president to remove civil officials without senate's consent. Secondly, Command of Army Act which prohibited president from issuing military orders except through commanding general of army (Grant) whose headquarters were to be in Washington and who could not be relieved or assigned elsewhere without senate's consent</span>
