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what is the advantage of having a large surface area?

Gas exchange surfaces tend to have the adaptation a large SA:volume ratio. This is advantageous as it increases the area over which gases and other materials can be transported into and out of the organism, ...
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Answered by Saskia D. • Biology tutor
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How does myelination affect nerve impulse conduction velocity?

Nerve impulses are propagated in the form of action potentials, involving the rapid depolarisation of the nerve cell membrane from -70mV to +30mV, before repolarisation occurs returning the membrane potentia...
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Answered by Thomas W. • Biology tutor
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Analyse the reasons for the Nationalist victory in the Spanish Civil War.

Many reasons have been given for Nationalist victory in the Spanish Civil War, although Republican loss was by no means predictable. Some historians have focused on domestic factors, others international con...
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Answered by Jessica Y. • History tutor
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What the integral of e^2x*x? (limits 0,1)

Whenever you see an integral with a product as the integrand, check if integration by parts works. That is, Int(v(x)*u'(x)) = u(x)v(x)-int(u(x) v'(x)) So you should see that its easier to call v(x)=x and u'(...
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Answered by Oliver O. • Maths tutor
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A shop trying to sell a laptop reduces its price by 7% at the very end of each week, from an initial price of £600. If you have £365 to spend, how many weeks must you wait until you can buy the laptop?

This is a simple question, but it's important to not get confused when thinking about how the laptop's price gets reduced. We know the price starts at £600, and that it goes down by 7% each week. If somethin...
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Answered by Kiavash S. • Maths tutor
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