Top answers

Why do the muscles of the Iris contract and relax?

To alter the size of the pupil, so the correct intensity of light is allowed through. Enough light is let through to allow clear vision, but not so much light that the retina might become damaged.
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Answered by Calum M. • Biology tutor
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Which state can a substance NOT be in if heat transfer through convection is occurring?

Solid.
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Answered by Calum M. • Physics tutor
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What is an enzyme and what effect does temperature have on enzyme activity? (6 marks)

An enzyme is a globular protein that acts as a biological catalyst. They work by reducing the activation energy of chemical reactions, which increases the rate of reactions. All enzymes have an optimum tempe...
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Answered by Isabel O. • Biology tutor
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What are the limitations on the Prime Minister?

The media: Can pick up on small things such as Gordon Brown referring to Gillian Duffy as a bigot. The Party: The Conservative Parties backbench demands for a European Uniion referndum when the Prime Ministe...
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7698 Views

What are the advantages of franchising?

The franchisee will be buying into a established brand so there will be less risk of the business failing because they have a good repuattion and have a product which consumers will demand. They will benefit...
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3980 Views