Read the excerpt from "a history of voting rights. " in 1870, the fifteenth amendment to the constitution became law. The amendment established that the right of citizens of the united states to vote could not be denied by the united states or by any state on account of race, color, or previous condition of servitude. Which aspect of historical context does this excerpt describe? a development in world events a change in society and its values a development in technology a change in national politics.

This graph represents four ecosystems. each ecosystem has a different number of species, adding to its biodiversity. different colors represent different species. which statements correctly summarize the data depicted by the graph? 1. ecosystem d has more biodiversity than ecosystem c. 2. ecosystem b has more biodiversity than all the other ecosystems. 3. ecosystem a has more biodiversity than ecosystem b but less biodiversity than ecosystem c. 4. ecosystem b has more biodiversity than ecosystems c and d but less biodiversity than ecosystem a. 5. ecosystem a has more biodiversity than ecosystem c but less biodiversity than ecosystem b.