Someone plz help me find all of the sentence in a (infinitives) ways plz

What group has historically made up the largest portion of immigrants in mexico?

How are farmers that use no plow farming methods able to improve air quality for the people around the fram

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.