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Alveoli have features that speed up the rate of diffusion so that gases can be exchanged quicly. They have a thin exchange surface - the alevolar epithelium is only one cell thick, which means there's a shor...

Questions that contain sources are usually looking for you to pick out as much information as you can that gives you an idea as to what is going on. They can come in the forms of photographs, paintings, newp...

The temperature of the earth is a balance between the heat it gets from the sun and the heat it radiates back out into space. Gases in the atmosphere absorb most of the heat that would normally be radiated o...

Quotations and examples are key to wrting a good essay. It is often the case that short quotations consiting of only a few words can be much more effective in suppporting your point than long quoations of ma...

We need to differentiate x 2 sin(3x). We know how to differentiate (x 2 ) on its own, and how to differentiate sin(3x) on its own. So we can use the Product rule: dy/dx = (d/dx(x 2 ))sin(3x) + x 2 (d/dx(sin(...