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babunello [35]
3 years ago
14

Which type of stimulus is an allergen, such as pollen?

Biology
2 answers:
SSSSS [86.1K]3 years ago
5 0
Since it's an outdoor door allergy, that that means it's an external stimulus. Hope this is right.
konstantin123 [22]3 years ago
3 0
Since it is outside your body, the answer is B, external stimulus
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A decrease in the autonomic tone of the smooth muscle in a blood vessel would result in:.
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A decrease in the autonomic tone of the smooth muscle in a blood vessel would result in an increase in blood flow through the vessel.

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