For germany, why would the most efficient form of attack on britain be by air? (1 point)

-the distance between berlin and britain prevented tanks from moving swiftly.
-the mountain ranges made ground troops too difficult to move, especially in winter.
-the trenches of the maginot line made ships difficult to move to shore.
-the english channel and north sea served as barriers to advancing german ground troops.

The right answer is "The English Channel and North Sea served as barriers to advancing German ground troops."

The Germans had managed to easily surpass the Netherlands, Belgium, and France after a series of lightning strikes, leaving the United Kingdom virtually alone in Western Europe. The German High Command knew of the difficulty and impracticability of an amphibious attack on England while the British Royal Navy controlled the English Channel and the North Sea.  On July 16, the German dictator Adolf Hitler ordered the preparation of Operation Sea Lion, the invasion of Great Britain with amphibious and parachute forces. But before an infantry invasion could be authorized, it was crucial that the Luftwaffe conquer air superiority over British skies.  In September the RAF, using night bombing, had already thwarted German preparations on the coast, and the Luftwaffe would also fail to incapacitate the British air force.  Hitler was forced to postpone and subsequently cancel Operation Sea Lion. Germany suffered heavy casualties, with many qualified pilots and good airplanes being lost, and by the end of October 1940, after three months of operations, they were no longer able to launch daytime airstrikes on the United Kingdom.  

the crusaders are identified in the painting;

c. by the red crosses on their backs

angel island immigration station was an immigration station located in san francisco bay which worked from 1910 to 1940. the majority of immigrants that got there were from the asian hemisphere, specifically from china, japan, russia, and south asia, being china the country from where more people arrived.

the number of foreigners arriving at it took the attention of americans who feared the new arrivals would take their jobs. the work opportunities were not abundant due to the economic comedown of 1870 and the asians, as newcomers, were willing to work for cheaper wages. soon they started to be seen as a threat, which led to an increased discrimination against the chinese - the biggest ethnicity arrived at this station until 1915 when japanese immigrants outnumbered them - being considered as unsuitable americans hence their looks and social situation.

at the station, the immigrant's detention may vary depending on how long the interrogation process took: it could be weeks, months, or even years.

finally, in 1940 an explosion destroyed administration building located on the island, so the united states government decided to stop the process.