Answer:
Conditioned stimulus
Explanation:
The conditioned stimulus is a previously neutral stimulus that, after becoming associated with the unconditioned stimulus, eventually comes to trigger a conditioned response.
Cell theory was fdiscovered in the 17th century. but the first. cell theory was credited in the 19th century.
Their gravitational pull towards the planet?
Antigens are substances capable of mobilizing the<u> </u><u>IMMUNE SYSTEM</u>
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<u>Your answer would be: </u> IMMUNE SYSTEM
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<u>Hope that helps! </u> : )
