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In order to calculate the value of a number raised to the power of a fraction, you first find the root of the number according to the value of the denominator (bottom number of the fraction).

In th...

There are four key points to natural selection:

• first, that individuals in all species show variation
• second, that this variation is genetic and therefore heritable
• third, t...

DOPAMINE = Responsible for motivation/reward. Important in addictive behaviour. Dopamine is released when doing a rewarding behaviour. Drugs increase dopamine levels. Can be environmental → seeing a pack ...

As a general rule think about ser being a permanent description and estar being temporary.

For example, to say someone is tall, use ser and you if you are saying that they look tall today you would...

As a general rule, the preterite is used when there is a finite beginning and end. If there is any ambiguity then use the imperfect. There are also specific rules for each tense.

If you are descr...