The answer is A, the first one
The primary responsibility of air traffic controllers is the separation of aircraft. They control traffic in and around airports and in the terminal and en route airspace in between. Controllers speak directly with pilots, notifying them of traffic or weather in there vicinity.
I think it is corn. That's only one of them. The others might be like fine silk
Option C
The peer review process, in which scientists submit write-ups of their ideas and experiments to a set of colleagues who judge how good the ideas are before the ideas can be published, is: A useful and important, even if imperfect, mechanism of quality-control for the scientific literature
<u>Explanation:</u>
The peer-review practice endures to approve scholarly work, accommodates to enhance the worth of proclaimed research, and builds networking circumstances in research areas. Notwithstanding critiques, peer review is yet the unique internationally affirmed system for research validation.
Peer review guarantees that documents undergo a fair evaluation and skillful opinion, enabling scholars to develop their script and therefore high-quality experimental interpretation and articles to be proclaimed. It also encourages the browsers to believe the scientific uprightness of the report and to present notified declarations where peer reviewer comments are ready.
Natural resources are resources produced by the Earth and occur in nature, hence "natural". They can replenish quickly, or take millions of years to form, like oil and some precious metals and jewels. Hope this helped!
