Salamanders can regrow entire limbs and regenerate parts of major organs, an ability that relies on their immune systems, research now shows. ... They then wiped out some or all of the macrophage cells to determine whether these cells were essential for regrowing the limbs.
Answer:
In reality it helps us concentrate and focus and scientifically proven that it helps us remember things better
Explanation:
It is scientifically proven
c for part a part b is "This is a claim because claims are facts" and 4 is C and A
you should give us a source
