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There are five main features that effect the rate of diffusion:

The rate of diffusion INCREASES if there is a short diffusion path because there is less chance of collision of particles.

The...

Lungs contain millions of alveoli which act as the gas exchange surface for the body, O2 is absorbed and Co2 is excreted by the body via the lungs which contain a large number of small 'air sacs' known as...

Emphysema affects the structure of the lungs called the alveoli. Each healthy alveolus has a large surface area in order for maximum diffusion of oxygen in the lungs.

If someone is affected by emph...

Mark-recapture is a method of estimating a population size. A sample from the population is captured using an appropriate method, marked, and released. A second sample is then captured after an interval a...

Replication involves the synthesis of the leading and lagging strand which occur in a 5' to 3' direction. First helicase unwinds the DNA strand, while topoisomerase relieves the strain created by the unwi...