Re-order paragraphs

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The text boxes in the left panel have been placed in a random order. Restore the original order by dragging the text boxes from the left panel to the right panel.
Brain’s function
d) The barrier serves a vital role, but is also poses a tremendous challenge for scientists developing drugs to treat brain-based disorders.
c) Our body therefore protects the organ fiercely: The central nervous system polices particles traveling through the bloodstream and invites only the safest into our cognitive chamber.
b) It coordinates our movements, our words, our relationships, and the ability to pass on our genes.
e) This selective process occurs due to a proactive boundary known as the blood-brain barrier.
a) The brain is our most treasured possession.
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