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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...

There is no unique way of telling what grammatical gender a word has. I therefore recommend, whenever you learn vocabulary and new words, learn the gender with it. Learn them as one.

However, there...

In french, three different kinds of verbs can be made: the '1st group' ones finishing by -er, the '2nd group' ones by -ir and the '3rd group' finishing by any other ending (-oir for example). The '1st gro...

There is a set number of verbes which use "être" as their auxiliary verb. These verbes are also called verbes de la gare. They are associated with movements of people and you can use them when i...

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 ...