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How is the alveoli adapted for its job?

The ruched, cloud-like structure of the alveoli means that there is a large surface area for gas exchange between the blood and the lungs, which increases the efficiency of the process, meaning the supplies ...
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Answered by Phoebe A. • Biology tutor
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Outline the similarities and differences between the social and biological areas of psychology.

Similarities - Both areas use the scientific methodology to measure behaviour, by manipulating the independent variable to measure the effects it has on the dependent variable. In addition, experiments in bo...
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Answered by Phoebe A. • Psychology tutor
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What are enzymes and how do they work?

Enzymes are small proteins found in living organisms. They are described as biological catalysts, meaning they speed up reactions and remain unchanged at the end, ready to do the same again. They are vital f...
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Answered by Isabel M. • Biology tutor
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How do you show some quadratic polynomials are always greater than 0?

Usually, there are two ways to solve this kind of problems. You could re-arrange the polynomial, make it become a square plus a constant, then the polynomial is greater or equal to the constant since a squar...
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Answered by Luke W. • Maths tutor
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What is a mole?

A mole is a measure of quantity, such that when you have a mole of something, you have 6.02 x 10 23 atoms/molecules of it. The number of atoms/molecules in a mole is called "Avogadro's Number" and ...
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Answered by Amy F. • Chemistry tutor
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