CAI lun invented paper. By CAI lun in was in the above order, summed up the predecessors' experience in paper making, and further transform the papermaking technology.

s the president shall be commander in chief of the army and navy of the united states, and of the militia of the several states, when called into the actual service of the united states; he may require the opinion, in writing, of the principal officer in each of the executive departments. sooo yeahhh

explanation:

d. it was created with the idea that it could be easily revised if it was ineffective

we'll, upper nubia is the region of ancient nubia between the second and sixth nile cataracts, but lower nubia is the region of ancient nubia between the first and second nile cataracts.

so the correct answer would be (lower nubia).