Answer:the best activity Karen should do is weight training
Explanation:
The measure of how well your heart gets oxygen rich blood to your muscle while you're exercising is called anaerobic fitness is the correct answer.
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I believe it can result in permanent brain damage
Answer:
The skin
Digestive tract
Vagina
Mucous membrane
Explanation:
The skin prevents microbes from entering the body
Digestive tract e.g. stomach acid is a natural defence mechanism
The vagina is acidic and this prevents harmful bacteria from growing with it's own flora.
Mucous membranes e.g. lining of the mouth, nose, eyelids are all defense mechanisms.
