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When two populations are geographically isolated they can no longer interbreed. There is no mixing of genes between the groups and over generations differences build up between the populations. This is ca...

The mitochondria has three key parts, matrix, inner membrane, and outer membrane. The matrix is the internal space where the krebs cycle takes place. All enzymes for the krebs cycle are in the matrix, ens...

Oxygen moves down the trachea, into the bronchi and into the smaller bronchioles, down a pressure gradient. Once the oxygen reaches the alveoli it moves down a diffusion gradient across the alveolar epith...

This is a fairly common problem across many A level subjects but in my experience particularly amongst those taking biology papers. Whilst there are several strategies to counteract this, such as prioriti...

Often this particular style of question ranks amongst the most poorly answered by students. However, it is often very easy to pick up marks without any knowledge of the subject matter whatsoever. The firs...