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To solve a simultaneous equation we use a method known as elimination. We choose to 'eliminate' or remove the X or Y term. To 'eliminate' x we must firstly determine the lowest common multiple 3 and 2 (as...

For this question, it is best to first take out a factor of 2 from the equation. This will leave you with y=2(x²+2x-3). We then need to work out the two numbers that will multiply to -3 and add...

This question comes up often in GCSE papers and is a key topic when talking about exchange or cell biology. 
Active transport comes hand in hand with diffusion and osmosis. It is a key mechanism for ...

Ionic bonding occurs between metallic and non-metallic atoms. Electrons are transferred from metal atoms to non-metal atoms. This results in positively charged metal ions and negatively charged non-metal ...

In spermatogenesis, germline epithelium in the seminiferous tubules of the testes divides by mitosis and then a period of cell growth occurs, changing them from spermatogonia to primary spermatocytes. The...