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Explain what eutrophication is and how it is caused

Some farmers use too many fertilisers, so when heavy rain comes, these can run off the fields. This then pollutes nearby streams and rivers, leading to eutrophication. The process of eutrophication is as fol...
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Answered by Abdullah T. • Biology tutor
5100 Views

Explain why the pancreas is described as both an endocrine and an exocrine organ.

This question requires you to know the difference between endocrine and exocrine glands, as well as knowing the basic functions of the pancreas. Endocrine = secretes directly into the blood stream(usually ho...
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Answered by William M. • Biology tutor
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if y= e^(5x) what is dy/dx

For differentiation it is known that d/dx(e^x) = e^x always.This example is slightly more complex as it includes a product of x as the power.In this case we can simplify the question by setting 5x= u therefo...
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Answered by Lucinda D. • Maths tutor
5846 Views

Draw the electronic structure of Sodium Chloride and explain how an ionic bond affects the melting and boiling point.

Ionic bonds are very strong, with elements involved in a compound having a full outer shell of electrons due to donating and accepting electrons, allowing them to be in a very stable state. In this case, Sod...
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Answered by Hans D. • Chemistry tutor
5800 Views

Every year in Britain there are nearly 25 000 car fires, yet it is estimated that only five per cent of motorists...Which of the following is the best statement of the flaw in the argument above?

It implies that the occurrence of car fires is related to the lack of an extinguisher.
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Answered by Lucy E A. • TSA Oxford tutor
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