What is the dependent clause and subordinating conjunction or relative pronoun?

[Simonah]

Dear teachers,

What is the dependent clause and subordinating conjunction or relative pronoun in this sentence?

Hikers who attemp to walk the whole length of the trail have to put their lives on hold for several months.

Many thanks
Simonah

[Mister Micawber]

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'Who' is the subordinator and is the head of the dependent clause.
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_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber