An introduction to evolution. From the cloning of early single-celled organisms to sexual reproduction. The cell is introduced as the first life. We see cells dividing in the process of asexual reproduction, which is described as cloning. Images of sperm, eggs and sexual reproduction are then shown. This is described as the catalyst for the huge diversity of life we currently have on Earth. It also explains that sexual reproduction and chance have led to the evolution of man.

This clip is from:
Bitesize Secondary, Science 1
First broadcast:
28 February 2008

This clip can be used by students as a brief introduction to the diversity of life on Earth. The concept of evolution should be discussed in terms of variation and inheritance and adaptation. Discuss the question posed by the clip. Do students think that organisms can be described as more or less evolved? Explain that different species adapt to survive and reproduce in a particular environment rather than following a specific line of development and improvement.