Choose all the right answers.

Which practices of the pioneers changed the prairie land balance?

factories
use of insecticides
fenced off land
agriculture
introduction of sheep and cattle
excessive hunting

fenced off land

agriculture

introduction of sheep and cattle

excessive hunting

Explanation:

These are all factors that the pioneers introduced to the prairies and which forever changed the natural environment of the region. The pioneers brought with them sheep and cattle, as they considered these necessities to sustain their way of life. However, these were new introductions to the area and required the land to be fenced in order to keep them from leaving. To sustain themselves, they also relied on agriculture and hunting. Agriculture changed the ecosystem of the area, as well as its appearance. Hunting was eventually done to an excessive degree, leading to the decline of many species, such as the American bison.

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