choose the letter of the best answer write your test notebook
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1.) Four.
2.) Ventricles.
3.) Doing activities like playing outside, riding your bike and swimming.
4.) Urinary system.
5.) Respiratory system.
6.) Carbon dioxide.
7.) it relax and become dome shaped.
8.) Windpipe.
9.) Diaphragm.
10.) Brain, spinal cord and nerves.
11.) Cerebrum.
12.) Crebellum.
13.) Neurons.
14.) Brain stem.
15.) Hypothalamus.
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