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Explain why an extensive network of capillaries and ventilation of the lungs helps to maximise the effectiveness of gas exchange.

The capillaries deliver blood that has high carbon dioxide levels and low oxygen levels and take away blood that has high oxygen levels and low carbon dioxide levels. This means there is always a concentrati...
AC
Answered by Annabel C. • Biology tutor
7316 Views

Compare and contrast the structure and bonding of diamond and graphite.

1 mark each for each of these points:similarities:only contain carbon atomsatoms covalently bonded to each otherlattice structuredifferences:diamond has four covalent bonds and graphite has threediamond has ...
AC
Answered by Annabel C. • Chemistry tutor
5024 Views

How can get my essays into level 5?

One good way to improve your essays is to use real world examples and data to backup your arguments. For example when explaining some of the advantages of a monopoly use examples from the real world. For ins...
AP
2365 Views

How do you identify metre in poetry?

Identifying metre can be tricky, since it is sometime quite subtle. However, the easiest way to find the metre is to read the text out loud, placing additional emphasis wherever it feels natural. This will u...
GW
Answered by Gregory W. • English tutor
2006 Views

Solve for x and y using these simultaneous equations: 2x + 3y = 21, y = 2x - 1

Substitute y = 2x - 1 into the first equation. 2x + 3(2x -1) = 21 2x + 6x - 3 = 21 8x = 24 x = 3 Therefore y = 2(3) - 1 = 5
AL
Answered by Alexandra L. • Maths tutor
3334 Views