Silent Type, Not an Extrovert
Puzzle 11 of Quiet Things Piece of Cake Pack
Question is: Silent Type, Not an Extrovert
and the answer is: INTROVERT
Word Meaning:
INTROVERT — (zoology) An organ or other body part that is or can be turned inside out, especially an anterior portion of some annelid worms capable of retraction.
Definitions from Wiktionary.