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Biology 8 Online
OpenStudy (anonymous):

Which type of stimulus is an allergen, such as pollen? A. response to a stimulus B. external stimulus C. internal stimulus D. inborn stimulus Medal

OpenStudy (anonymous):

Im not sure if its even biology, I asked this in earth science as well XD Im so mixed up

OpenStudy (anonymous):

What do you think it is? I'll try to help the best I can!

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