Why is earth's current atmosphere made up mostly of nitrogen and oxygen?
a. earth is eroding.
b. earth is warming up.
c. earth is continuing to cool.
d. earth has living things on the surface.

Which action by the us war department angered chief red cloud to the point that he refused to sign the treaty of fort laramie ? a) the killing of buffalo by the united states troops b) the appointment of troops to the powder river basin c) the burning of parts of the powder river basin d) the murder of chief red cloud’s wife

Which of the follow modern activities would only have been possible after the neolithic revolution

Known for criticizing the traditional roles of women.