A vaccine uses a live pathogen that is too weak to make you sick. Once it enters your body you defeat it easily. Now that yur body is familiar with it your body can fight off the disease in the future.
The 3 domains of life would be, Archaea, Bacteria and Eukarya!
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The example given explains neuroplasticity.
Neuroplasticity, is also referred to as brain plasticity and this occurs when there's a change in the nervous system as a result of a response to a particular stimuli.
In this case, the neural networks that are in the brain will change and the changes can bring about systematic adjustments in the body.
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