The government responded to student protests in Tiananmen Square by А. instituting democratic and economic reforms.
B
introducing government-regulated capitalism.
sending tanks and troops to put down the protest.
D
forcing the protesters into exile.

i believe

clean air is essential for health and survival

clean air provides nitrogen gas for plant respiration

clean air supplies oxygen that enables living organisms to breathe

hope this

i am brianly

sorry if this doesn't

they produces sugar..

hope this , question was a little open ended