Select your answer:
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Immunity and Vaccines › ViewAn organism that enters a life form and causes disease or sickness is a/an:
A. macrophage
B. pathogen
C. vaccine
D. flu
Living Organisms › View
In humans, the digestion process begins in
A. the intestine, with squeezing.
B. the mouth, with chewing and saliva.
C. the stomach, with churning and acid.
D. the esophagus, with pushing towards the stomach.