The greek word for uncuttable is where we get our word for a(n)

Atom

Atom comes from the Greek prefix “a” which means not and the Greek word “tomos” which means cut. Effectively, the word atom comes from the Greek word meaning uncuttable. The word was proposed by Greek philosopher Democritus who lived in ancient Greece

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer

answer; caravan;