What is Evolution?
This short video helps explain the process by which evolution occurs by looking at a distant ancestor of the horse. Having large molar teeth conferred an advantage on the animals as they could eat the plentiful grass and have a greater chance of growing to maturity and reproducing, some of their offspring inheriting the large teeth of their parents. The video shows that over many generations, the animals with the larger teeth grew to outnumber those with small teeth as they were less likely to grow to maturity and reproduce.
This resource has been provided by Primary Evolution, produced by Reading University with support from the Wellcome Trust.