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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
6150 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
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What is the name of the first stage of respiration?

Glycolysis. This is an anaeorbic process whereby glucose is converted to pyruvate via triose phosphate. This process gives out a total of 4 ATP molecules but requires 2 ATP molecules to convert glucose to tr...
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Answered by Adam S. • Biology tutor
3758 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
9521 Views

How do I integrate log(x) or ln(x)?

The integral of log(x) is not necessarily straight-forward. Though we can use the fact that d/dx(log(x)) = 1/x to help us. Rather than simply trying to integrate log(x), we can use integration by parts on 1 ...
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Answered by Daniel F. • Maths tutor
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