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What is an allergy?

Allergy is the result of the immune system overreacting to harmless stimuli in the environment. Examples of stimuli or 'allergens' include pollen, dust, eggs and milk. The body recognises these harmless alle...
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Answered by Saadiyah K. • Biology tutor
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What is peristalsis?

Peristalsis is the mechanism by which gut muscles contract. There are two main types of muscle in the gut: -longitudinal -circular Together, these muscles contract to create waves of movement. This allows fo...
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Answered by Saadiyah K. • Biology tutor
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How best to structure answers to essay style exam questions?

The best method would be to follow the PEA technique. PEA stands for: POINT EVIDENCE ​ANALYSIS First make a point about the given text. Then provide evidence by quoting a few words or a sentence from the tex...
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With reference to a named disease of affluence, outline the impact on health, economic development and lifestyle.

A disease of affluence affecting MEDCs such as the USA and the UK is Coronary Heart Disease. The rate of this disease is increasing due to the high rates of obesity and smoking in both countries. The disease...
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Answered by Laurie K. • Geography tutor
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Describe and comment on the social, economic and political implications of population change?

An increasing population results in the social problems of over-crowding, with the availability of less homes, increasing the demand for houses of multiple occupancy, and raising house prices. The latter imp...
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Answered by Laurie K. • Geography tutor
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