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How are alveoli adapted for their function?

The alveoli in the lungs have a high surface area to volume ratio that provide a higher rate of diffusion. They have very thin walls which are one cell thick that allow fast gaseous exchange between the alve...
AP
Answered by Achilleas P. • Biology tutor
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What are the different ways to solve a quadratic equation?

There are three main ways to find the roots of a quadratic and they all have different benefits.Firstly, suppose your equation is in the form ax^2 + bx + c where a,b,c are all real numbers. Then you could fi...
Answered by • Maths tutor
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GCSE English Language (AQA), paper 1, Q3... How has the writer structured the text to interest you as a reader?

First, remember that this exam question is the hardest and, across both papers, is only worth 8 marks from the 160 on offer. So don’t panic too much! You’ll have many other opportunities to pick up marks. Se...
Answered by • English tutor
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Define the different types of respiration.

Respiration is the process of transferring energy throughout cells within an organism. Energy is required for a lot of processes to take place in organisms such as: movement - for muscle contractions to take...
SW
Answered by Sarah W. • Biology tutor
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Solve the following simultaneous equations to give a value for both x and y: 3x+3y=9 and 2x+3y=5

Subtract the bottom equation from the top equation to get 3x-2x=9-5 (you don't see no y values in this equation as the y's have disappeared and cancelled eachother out as 3y-3y=0)2) So 3x-2x=9-5 equals 1x=4 ...
AF
Answered by Amy F. • Maths tutor
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