Here you go and hope this helps.
Answer: 2a
Explanation:
NATO is an organization that is focused on safeguarding its allies from any forms of military and political threats, while the UN and NATO are two different organizations, they share similar goals.
(Hope this helps)
Answer:
https://www.nasiol.com/about-nanotechnology/?gclid=Cj0KCQjwxIOXBhCrARIsAL1QFCZHw6fcd_dTT4AjtdAto8Ij9j-vaRmSefL2icWh6L3oCSqaqt2bAY8aAjNiEALw_wcB
