Organism Type Covering 6% of Earth’s Land Surface
Puzzle 19 of Dungeon Delving Pack
Question is: Organism Type Covering 6% of Earth’s Land Surface
and the answer is: LICHEN
Word Meaning:
LICHEN — Any of many symbiotic organisms, being associations of algae and fungi, often found as white or yellow-to-blue–green patches on rocks, old walls, etc.
Definitions from Wiktionary.