CHEAT!
The missing words in the quiz (not necessarily in order) are:
entrance
|
eyes
|
troglozenes
|
ceiling
|
fungus
|
twilight
|
cool
|
troglophiles
|
dark
|
pigment
|
temperature
|
floor
|
troglobites
|
walls
|
light
|
humid
|
moist
|
bacteria