The questions in this quiz are suitable for GCSE biology students studying homeostasis, the nervous system, the reflex arc, the brain and the eye. If you struggled with the quiz, don't panic - we've ...
Justina: Your body contains billions and billions of nerve cells, or neurons. Georgina: There are around 100 billion in your brain and over 13.5 billion in your spinal cord alone. Justina: Your brain ...
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