why would realists not accept that global problems like pollution or infectious diseases constitute major security threats to states?

That's  a project for you to do. btw your teacher probably uses a plagiarism detector and if you do copy anything on this site she/ he will find out and instead of getting a good  or bad grade you'll  get a 0 no exceptions, and they'll  probably call ur parents. so do some research ask friends and fam to you.

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Answer(b) a diet high in fiber and low in saturated fats;