1.How do i turn on more part of my brain

1.How do i turn on more part of my brain and get more smarter?

2.How do nerves control every organ and function of body?

3.How do trees give earth all its oxygen?

4.How does the outer layer of skin cell  on my finger  detect when i am touching an object?

5 What are the major issues in biology?( effects human life too)

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