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Two populations become separated by a barrier such as sea (geographical separation). As a result populations cannot interbreed, hence gene flow between two populations is prevented. As a consequence, only a ...

Create a revision timetable. It doesn't have to be to the hour, but make sure to write down all the topics you need to cover. For example, during my A-levels I'd do one mini topic every 2 days. - Start early...

There are many reasons behind Stalin's rise to power. After the death of Vladimir Lenin in 1924, there was a power vacuum created with in the Communist Party. Many people believed that the natural heir to th...

First of all, you should find the angle between the vector and the normal of the plane using the rule cosX= a . b /mod a mod b . The normal can be found easily from the cartesian equation of the plane. For e...

In most core 1 papers this kind of question is usually asked. First of all an asymptote is a line that is close to an axis but never touches it. Now look at the graph as a normal reciprocal graph of y=1/x th...