adaptation, the quality of being suited to some condition or requirement / (biology, evolutionary theory) an adaptation; a trait that makes an organism better suited to an environment

adapt, adjust, fit in, conform

an arctic fox

an arctic fox

to live; to exist

stern, grave, forbidding; dignified, stately / strict, unforgiving / tight, close, without gaps / harsh, tough, extreme, severe, hard to withstand (said of natural phenomena)

(rare, archaic) wondrous, miraculous, splendid, sublime / (rare, archaic) dignified, solemn, stern, noble, refined / (rare, archaic) beautiful, pretty

the way in which something is tightly packed or close together without gaps

cold

cold, chilly / (by extension) poor, poverty-stricken / midwinter, cold season