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True [87]
3 years ago
12

Stomach acid is which kind of barrier to most pathogens that enter the digestive system?

Health
2 answers:
Svetllana [295]3 years ago
8 0
The correct answer is chemical.
kolbaska11 [484]3 years ago
7 0
The correct answer is physical
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The sa node ____________ fires at regular intervals.
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The sa node <u>spontaneously</u> fires at regular intervals.

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