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Answer: B. cold heavy cream
Explanation: I'm a Penn Foster student to and these tests are ridiculous so and i took the test already and b is correct.
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.
The spinal cord send nerve impulses to and from the brain
