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Earth Sciences 12 Online
OpenStudy (anonymous):

I need some help XD Im not sure what kind of science this is... if it is earth science, can you answer it? Medals for either XD Which type of stimulus is an allergen, such as pollen? A. response to a stimulus B. external stimulus C. internal stimulus D. inborn stimulus

OpenStudy (anonymous):

It is an external stimulus since it comes from an external force.

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