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There are two aspects to consider to understand the difference between the central and peripheral nervous system. Anatomically speaking, the CNS is made up of the brain and the spinal cord; the PNS is mad...

In terms of the structure, simple covalent substances are made up of molecules. These molecules are bonded together by a shared pair of electrons, which forms the strong covalent bond. Between molecules, ...

a junction between 2 neurones 

Factorise 2x²-4x-6=0

2(x²-2-3)=0   ->    2(x+1)(x-3)=0

split factors up       2=0 ,  (x+1)=0   and   (x-3)=0     

                                x+1=0  ->...

1. Check that your triangle is a right-angled triangle. Remember, you can only use pythagoras theorem or SOHCAHTOA on right-angled triangles.
   
2. Label the sides O, H and A: opposite (the an...