4. During what process does ammonia (NH3) convert to nitrate ions (NO3)- ? a. Nitrogen fixation
b. Nitrification
c. denitrification

The black hawk war began (20 points) a. sauk leaders signed the treaty of dancing rabbit creek. b. congress passed the indian removal act. c. the sauk moved onto a village established by white settlers. d. federal officials ordered the removal of all american indians from illinois.

Which phrase best completes the diagram? apex

What from the columbian exchange had perhaps the biggest impact on the world?