1. Species - groups of or of same

2. Number of species
- million
1 million named; 100,000 (10%) in
species + become

3. In past - more species than out - now is true
main periods of extinction - heading to period - 27,000 per or 3 per
20% of all species extinct in years

4. Reasons for extinction.
In past such as and .
Now because of of population - , destruction of natural etc.

5. Why we should prevent extinction.
Many species can be to humans
i) Medicinal - can be obtained: nearly US drugs contain natural
ii) - necessary for modern - natural resistance c.f. monocultures lack
iii) - valuable to destroy e.g. wasps

6. What we can do.
i) Control population
ii) Set up protective for species
iii) Create society

7. Conclusion
Awareness that is advantageous
Rich nations should their overdevelopment
and help poorer nations to habitats - give and make new