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What are the key different types of selection?

Directional selection occurs when a phenotype at the extreme end of a distribution is favoured and so over time the distribution shifts in the direction of the favoured phenotype. An example of this is the d...
AC
Answered by Abigail C. • Biology tutor
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What is a Production Possibility Frontier?

A PPF is a graph that can be used to explain opportunity cost , and trade off. It is made up of a concave line with, for example, apples on the vertical axis and bananas on the horizontal axis. Since resourc...
MC
Answered by Maisie C. • Economics tutor
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How can I include critical material in my examination essays?

Examiners want to see you properly engaging with any secondary material you use - it's important not to just drop it in and ignore it. Read a couple of secondary articles on your set texts and make sure that...
LH
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Explore the view that ‘at the end of the tragedy the audience’s sympathy is with Bolingbroke rather than Richard’.

Introduction – Suggest that there is a shift change in audience sympathy towards both Bolingbroke and Richard across the course of the play. Set up the initial responses in the scene of Richard’s treatment o...
AJ
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Integrate(1+x)/((1-x^2)(2x+1)) with respect to x.

To simplify the fraction first notice (1-x 2 ) = (1-x)(1+x) so the common factor of (1+x) in the numerator and denominator can be cancelled. (1+x)/((1-x^2)(2x+1)) = 1/((1-x)(2x+1)), then we need to split thi...
RH
Answered by Ravinder H. • Maths tutor
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