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Active immunity is due to the over production of antibodies by the organism itself after the body's defence mechanisms have been stimulated by the invasion of foreign micro-organisms. Whereas, passive ...

An allele that has the same effect on the phenotype whether it is present in homozygous or heterozygous state. Dominant alleles mask the effect of recessive alleles. 

For the purpose of my explanation, I will use this sample essay question taken from the OCR F663 June 2013 paper: 

"Gloucester is no less than a tragic figure than his king" By ...

The imperfect tense is used for an action that was ongoing in the past (Je lisais un roman = I was reading a novel). These verbs are often incomplete, hence, imperfect. An example of this...

As the object is released two forces act on it.Its weight and and air resistance. At this point its weight is much greater due to the force of gravity on the object so it accelerates downward. As its s...