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Define the term 'phylogeny', how it is related to classification of species, and what kind of evidence is used in phylogenetics. (3 Marks)

Phylogeny is the evolutionary relationships between different species. Species within the same taxonomic group have shared phylogeny (i.e. they have a common ancestor). (1) Phylogeny is what taxonomic classi...
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Answered by Mary Y. • Biology tutor
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Solve the following equation by completing the square: x^2 + 6x + 3 = 0.

Completing the square is a method of solving quadratic equations that cannot be easily factorised, without having to use the quadratic formula. The first step is to look at the coefficient of the second term...
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Answered by Emma C. • Maths tutor
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What are the differences between the types of plate boundaries?

There's four main types you'll need to know. These are constructive, destructive, collision and conservative - these basically are just different ways that two tectonic plates could interact. Constructive (a...
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Answered by Amelia G. • Geography tutor
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Why is the impact of drought usually greater in LEDCs than in MEDCs?

MEDCs do not rely on produce from their own country to feed their population, and instead, import a lot of it from other countries. Therefore, in a drought they are still able to feed their population despit...
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Answered by Issy P. • Geography tutor
17087 Views

How do you work out the equation for a line?

In order to work out the equation for a line, you need the gradient of the line and the coordinates of a point on the line. To find the gradient on the line, you look at two points on the line and calculate ...
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Answered by Sam B. • Maths tutor
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