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What is Natural Selection?

Natural Selection is the accepted theory of evolution first postulated by Charles Darwin and can be thought of as 'survival of the fittest'. It is the process by which a species gradually evolves through tim...
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Answered by Ellie W. • Biology tutor
6316 Views

How is the perfect tense formed?

The perfect tense is formed from : The auxiliary verb haber + the past participle of the verb , either ending in -ADO(-ar verbs) or -IDO(-er and -ir verbs) He hablado, He comido, He vivido. Example : COMER H...
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Answered by Rachelle O. • Spanish tutor
4527 Views

How do I know when to use être or avoir as an auxiliary verb?

An auxiliary verb is the first verb used in a compound tense (when more than one verb is present) such as le passé composé. Most French verbs take the auxiliary verb avoir - J' ai regardé la télé . However, ...
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Answered by Charlotte S. • French tutor
9686 Views

How does the structure of the red blood cell allow it to carry out its functions?

The main function of the red blood cell is transport oxygen around the body to other cells. It contains haemaglobin which allows the binding of oxygen. Its biconcave shape maximises the surface area to incre...
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Answered by Narumi I. • Biology tutor
87062 Views

How can i thoroughly analyse a source?

I always find it useful to cover up the actual image/picture initially, and focus first on the caption and what that can tell you about the souce - this also works to make sure the context and provenance are...
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Answered by Grace W. • History tutor
4643 Views