Which of the following is not a branch or part of the government?

Which of there factors contributed most to us westward expansion in the second half of the nineteenth century?

Witch one is it soo it the the question b. a,b, c,d

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