The answer is C! Microorganisms are things like fungi and bacteria which INFECT and CONTAMINATE our immune systems! Nasty bacteria fights off our good bacteria and gives us diseases. Hope this helps!
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Hi the answer id D, osteoporosisto the correct plant group.
good luck!
B. because entry points are vital to the spread of infection
-eat
-sleep
-take a how
-eat heath lunch
-and do yoga