When you say "protection from harm system," I assume you mean the Integumentary system. It's job is to protect the body from various kinds of damage. Hope this helped! :)
I think the first one because if the infection is severe, you want a higher dosage, hopefully this is correct
Two answers could be correct both B and D it does depend on the type of health work you are working in if you swim you burn calories and energy so being rested is a positive answer however by many health organizations or people in general 30 minutes is a safe time to swim after digestion, but if I was to say a more accurate answer would be B
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Looking pretty fire tho no cap
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