Throughout history, groups of people have formed cultures because
a) they got along with one another.
b) they had some common cause or goal.
c) they agreed about what all the laws should be.
d) they moved and were with the new community

Which phrases describe oxygen's roles in earth’s atmosphere? check all that apply. allows fuels to burn forms clouds that produce rain is the gas that animals breathe is used by plants to produce food forms ozone that absorbs the sun's harmful rays