9.Why is our nervous system important?
a.It absorbs the nutrients needed by our body
b.it removes waste from the body
c.It controls the other body systems so that they work properly.
d.it protects our body from harmful extemal elements.

10. Why do you suddenly move your hand away even before realizing that you touched a hotobject?
a.The muscle contract before the message reaches the brain.
b.The blood moves faster because of the heatb.
c.The message travels fast because of the heat
D.Message to and from the brain travel fast through the nerves.
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