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What is a pathogen?

An organism that causes disease e.g. bacteria, virus
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Answered by Erin W. • Biology tutor
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Research often uses laboratory experiments. Outline one weakness and one strength of this method.

A strength of this method of experimenting is that it is scientific. This is because the variables of the experiment are strictly controlled during a laboratory experiment, which further means that cause and...
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Answered by Erin W. • Psychology tutor
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Why does an increased heart rate during exercise help muscles contract?

An increased heart rate will cause an increase in blood flow around the body (increased cardiac output). This means that there will be more oxygen and more glucose being supplied to the muscles. Since oxygen...
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Answered by Adam D. • Biology tutor
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Identify and explain some differences between a federal and a unitary constitution?

A unitary constitution is a constitution in which the power is concentrated in the form of a central government which has ultimate power and authority over its jurisdiction. A federal constitution, however, ...
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How should I tackle an essay question?

Reading the question carefully is the first step as you can determine the exact meaning and demands of it and identify the key terms in order to define them. I find, especially in exams, jotting down the mai...
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Answered by Imogen C. • History tutor
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