This graph shows life expectancy in the united states. which factor best explains why the graph changes from 1990 to 2010? new technology protects soldiers from risky reconnaissance missions. new technology allows farmers to grow genetically modified crops. new technology allows us to find and use new energy sources. new technology has improved medical imaging and surgery.

The correct answer is - New technology has improved medical imaging and surgery.

The technology is developing very rapidly, and every year it makes big strides forward, and this includes the medical field as well. Pretty much everything in the medical field has been significantly improved, like the medical imaging and the surgeries, and that is saving millions of lives each year.

Because the medical field has improved so much, the people are able to live longer, thus the life expectancy is growing, and as the technology improves in the future, it will grow even further.

separate but equal was a legal doctrine in united states constitutional law according to which racial segregation did not violate the fourteenth amendment to the united states constitution, which guaranteed "equal protection" under the law to all people. under the doctrine, as long as the facilities provided to each race were equal, state and local governments could require that services, facilities, public accommodations, housing, medical care, education, employment, and transportation be segregated by race, which was already the case throughout the states of the former confederacy. the phrase was derived from a louisiana law of 1890, although the law actually used the phrase "equal but separate

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martin luther king (1929-1968) was an activist for the african american rights, mr. king has a profile of a kind leader that built a tenacity, respect and full of hope future. he was an activist through civil disobedience and no violence pressure mechanisms. he tried to build a more egalitarian and fair society. his efforts carried a reivindication message of the civilian rights to every west corners. for that reason, he won the nobel prize in 1964.