The grasslands of the midwestern United States have been grazed and farmed so that almost no grasslands remain with their original species of
plants and animals. How could people in the Midwest determine what kind of
natural ecosystem they are in?

A. Look in history books to determine what types of organisms lived
there before

B. Look around, since even a changed ecosystem is still an
ecosystem

C. Check yearly average rainfall

D. Check yearly average temperatures and see what types of plants
and animals live in those temperatures

B. Look around, since even a changed ecosystem is still an  ecosystem.

Explanation:

Ecosystem refers to the interaction or relationship that exist between living organisms and its surrounding environment. This environment provides habitat, food and other needs to the organisms. If the people in the Midwest determine what kind of  natural ecosystem they are in, they have to look around the environment they are living. This environment includes all the plants and animals that survive the change which occurs due to humans intervention.

there's multiple reasons why the conquistadors were so successful in colonizing central america, and some of them are:

- they were seen as gods;

at the beginning, the spanish settlers were seen by the natives as gods, and this was mainly due to their white skin, and the way they came with their boats.

- possessed superior weaponry;

the spanish had gunpowder and guns, as well as cannons, while the natives did not had any fire weapons.

- made cleaver alliances;

they used the situation of tribes hating each other, so they made alliances with some of them which served them very well.

- brought diseases;

the native people were not immune to certain diseases the europeans brought with them, so they were dying from seeming harmless things for european standards.

your wrong the correct is d i did edunity and the answer