250 words and two scholarly references

Do you think it is important that all species be prevented from going extinct? Explain your reasoning. Also, there is a process called “de extinction” where scientist use DNA from an extinct species and genetically “recreate” that species. Do you think this is a good idea? Explain you reasoning.

The link below shows a description of de extinction.

http://www.ted.com/talks/stewart_brand_the_dawn_of_de_extinction_are_you_ready