If an area has limited types of wildlife, this means that it has "<span>d. very few varieties of animals". For instance there could be lots of two different types of animals, but not a lot of different types of animals. </span>
The correct word is "assimilate."
The Carlisle Indian School had the motto of "Kill the Indian, Save the Man." This shows how the intent of this school was to make Native Americans act more like other American citizens. At these schools, students were mocked/harassed for speaking their own language, punished for practicing elements of their own culture, and forced to dress like "normal" American citizens. These schools provided for traumatic experiences for Native Americans.
The cotton gin greatly increased demand for slaves in the South, since it made it much easier to pick the seeds from the cotton itself--meaning that more cotton was able to be produced, which required more "hands in the field".