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Describe how fertiliser run-off can cause damage to a lake's ecosystem.

Fertilisers are generally high in nitrogen, to replenish the nitrogen in the soil assimilated by the crop plants. When this is drained into lakes in run-off, it can cause dramatic consequences. Nitrogen avai...
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Answered by William D. • Biology tutor
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How can I get a high mark in an unprepared discursive essay?

All too often, A level language students fret about entering the exam room about to write an essay they haven't been able to prepare for and which they'll likely know little about. No need to worry though, a...
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Answered by Aleksei O. • French tutor
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Find the equation of the normal line at the point H, where θ= π/6, on the curve with equations x=3sinθ and y=5cosθ

Step 1: We begin solving this problem by finding the gradient of the tangent line at H, which is equal to dy/dx. In this case, our curve has equations x = 3sinθ and y= 5cosθ. Now, we differentiate x and y wi...
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Answered by Pantelis K. • Maths tutor
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Express (3x^2 - 3x - 2)/(x-1)(x-2) in partial fractions

Step 1: When asked to exrpess something in partial fractions, we first compare the power of the numerator to the power of the denominator. In our case we have that the power of quadratic equation in the nume...
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Answered by Pantelis K. • Maths tutor
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What is natural selection?

Within a population of a species there is great geetic variation giving rise to variation in their phentoypes. Some phenotypes enable an organism to be better adapted to its environment than other members of...
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Answered by Sabrina A. • Biology tutor
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