Blackheads are a type of ________ acne

Polar substances are described as

a. A congregation of positive and negative charges on opposite ends of the molecules. b. A group of molecules that are diatomic. c. Molecules that possess only single atoms, also known as monatomic. d. Molecules that only have positively charged ions.

Chronic pyelonephritis with kinking of ureter is reported with code(s) ____________________.

Fill in the blank(s) with the appropriate word(s).