Answer:
International integration refers to the process by which supranational institutions replace national ones. Supranationalism challenges the foundations of realism (state sovereignty and territorial integrity) because the sate authority is subordinated to the global structure it can be perceived as giving up sovereignty.
Explanation:
The answer is d because all of the others will renew in time
Independent Variable is manipulated.
many fossils can be preserved in the ice. as well as radiation levels. oxygen levels. carbon dioxide levels. and many more to determine the climate of the past.