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Biology exams rely heavily on recollection and your knowledge of key facts and processes. If you have memorised these and have a good understanding of them, questions are often just a case of manipulating...

Osmosis is the movement of water across a semi-permeable membrane, down the concentration gradient. This means that if there is more water on one side of a membrane, it will move to the other side until b...

Questions about speciation are at their core based on Darwin's theory of evolution. As a result, we must recall GCSE knowledge of natural selection to combine with the new concepts in speciation introduce...

First figure out the phenotype (what is visible/expressed) of parents: Normal male x Normal female Next write down their gametes: X^H y and X^H X^...

One advantage of biofuels is that they can help to reduce CO2 emissions, by growing plants that photosynthesise, meaning any CO2 released is more balanced than with fossil fuels.Biofuels are also renewabl...