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A barrier separates the original population into two groups. Due to the different environmental conditions (selection pressures) either side of the barrier, different alleles are selected that better adap...

To form the preterite tense of AR verbs such as cocinar you have to take off the -AR- so you are left with the stem - COCIN- and add the specific endings:yo (me) - é, tu (you) - aste, el/ella (he/she) - ó...

You may be asked to rationalise the denominator of an algebraic expression if it contains a surd in the denominator - such as a^1/2. They can get slightly more complex than this though! What it ...

These questions are really mean but if given in the exam give ALOT of marks and whilst scary at first follow a very general pattern. First I would take either equation and re-arrange for the lone variable...

Enzymes are substrate specific proteins which act as biological catalysts and as temperature increases, we see an increase in enzyme activity. This occurs because an increase in temperature causes molecul...