One-word substitution (climate adjustment): Identify the correct verb meaning to become used to or to adjust oneself physiologically and behaviorally to a foreign climate. Context: Distinguish from ‘‘adopt’’ (to take up/accept) and general ‘‘adapt’’ (to adjust to anything, not specifically climate). Instruction: Choose the most accurate option.

Given data

• Meaning: become accustomed to a foreign/novel climate.
• Variety: British spelling ‘‘acclimatise’’ (US ‘‘acclimatize’’).

Concept / Approach
To acclimatise is to adjust to a new climate or environment, often involving physiological adaptation (e.g., altitude).

Elimination
Acclimatise — climate-specific adjustment. ✅Adapt — general adjustment; less specific than climate focus. ❌Adopt — to take up or choose (a child, idea, practice). ❌Accustom — to make familiar; lacks climate specificity as a standalone verb. ❌

Example
‘‘Trekkers must acclimatise to high altitudes before summit attempts.’’

Final Answer
Acclimatise