The first time a pathogen hits, our bodies do not know how to handle it properly. This means that our bodies take more time to handle it the first time around. The second time around, however, our bodies have altered so that they can handle the pathogen more efficiently. Hope this helps!
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It refers to ow much energy is expanded while exercising.
Answer:
A chemical called endorphins are released in your brain, this causes a stress relief sensation and mood boost
Explanation:
