Here are the highlighted or underlined clauses as requested:
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Noun Clause: Studies have shown that having a pet can reduce stress levels and improve mental well-being.
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Adverbial Clause: When people spend time with their pets, they often experience lower blood pressure and a calmer state of mind.
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Relative (Adjectival) Clause: Pets, which offer companionship and unconditional love, can significantly enhance a person’s overall health.