The brain is the coordination center of the
body. Most of your thoughts are chemical signals
between cells in your brain, or electrical signals
within the cells of your brain. However, you do
have certain 'thoughts' (mainly emotions) that are
driven by chemicals in your blood rather than
Complex animals need coordination to do
anything. Without it, muscles won't work, and of
course they can't sense anything. This is the
reason why almost all animals have brains
(though not quite all - sponges and jellyfish
don't for example).
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