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Mutation, meiosis and sexual reproduction causes variation amoung members of the same species. Species tend to produce more offspring than the environment can support leading to competition for food or pr...

Neurons transmit electrical impulses. Electrical impulses are action potentials propagated along the axons of neurons from one end to another. At a resting potential, sodium-potassium pum...

Two causes of inflation include an increase in the price of oil and a depreciation of the pound. An increase in the price of oil will cause the costs of production for producers to rise, such as when fuel...

Unseens can be very overwhelming, especially if you haven't done them before. The first crucial step is to make sure you carefully read the text. If you are provided with more than one passage to choose f...

Ionisation energy is the energy required to remove the valence electron of an element/atom. The reason this increases is because, as we go across the period, the atomic number of the element increases. Th...