Ancestral Trait That Recurs, Like Humans With Tails
Puzzle 2 of Ghost Hunting Hard Pack
Question is: Ancestral Trait That Recurs, Like Humans With Tails
and the answer is: ATAVISM
Word Meaning:
ATAVISM — The reappearance of an ancestral characteristic in an organism after several generations of absence; a throwback.
Definitions from Wiktionary.