Microbiology studies organisms too small to be seen with the naked eye
Answer:
your body produces melatonin it is to help you fall asleep
Explanation:
Explanation:
option D is the correct answer ..
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The integumentary system is the skin. Skin protects the inner organs from Bactria. Essentially the skin is a wall protecting against the outside world. It doesn't really release anything but is just there for protection.
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