Final answer:
The word 'requires' is an example of ambiguous language.
Step-by-step explanation:
The word in the sentence that is an example of ambiguous language is requires. Ambiguous language refers to words or phrases that have multiple possible interpretations or meanings. In this case, the word 'requires' can be interpreted in different ways. It could mean that hikers are obligated or necessary to have the equipment, or it could mean that having the equipment is simply beneficial or advisable. The lack of clarity makes the word ambiguous.