Which workers in factories were most abundant and least expensive?
a. managers
b. children
c. women

Can someone list any possible solutions to air pollution ?

Which evidence is most likely used to indicate the beginning of solar system formation? a. materials combined to form a mass. b. materials were pulled together by gravity. c. water condensed and collected to form oceans. d. different species of microorganisms lived on earth.

Can someone me with this plz? ! i'm putting 20 points on it!