You are missing some Flash content that should appear here! Perhaps your browser cannot display it, or maybe it did not initialise correctly.
Dr Mark Brown a senior lecturer in biology at Royal Holloway. His interests include: The evolutionary ecology of host-parasite interactions, the conservation biology of insects and the general biology of social insects.
Here Dr Brown explains evolution.
About the image: The modern theory of the descent of man, published in Ernst Haeckel's 1874 Anthropogenie oder Entwicklungsgeschichte des Menschen (The Evolution of Man). (Source: Wikimedia)
© 2011. All content, Pulse-Project.org