The animations are available at http://www.techapps.net/
Objective: Simulate changes in moth population due to pollution
and predation, and observe how species can change over time.
Charles Darwin accumulated a tremendous collection of facts to
support the theory of evolution by natural selection. One of his
difficulties in demonstrating the theory, however, was the lack
of an example of evolution over a short period of time, which
could be observed as it was taking place in nature. Although
Darwin was unaware of it, remarkable examples of evolution,
which might have helped to persuade people of his theory, were
in the countryside of his native England. One such example is
the evolution of the peppered moth Biston betularia. The
economic changes known as the industrial revolution began in the
middle of the eighteenth century. Since then, tons of soot have
been deposited on the country side around industrial areas. The
soot discoloured and generally darkened the surfaces of trees
and rocks. In 1848, a dark-col