1. Inter-dependence of living things

2. They form a stable system
Inter-dependence of living things
They form a stable system
The lions eat the deer.
This keeps the number of deer down.
With fewer deer, less grass will be eaten. Grass continues to grow and provides food for the deer continuously.
grass
deer
lion

3. Humans destroy natural habitat
Inter-dependence of living things
If...
Humans destroy natural habitat
We have no deer to eat!
We have no grass to eat!
More deer will die
Lions will also die
grass
deer
lion

4. If... Lions will die grass deer lion We have no deer to eat!
Inter-dependence of living things
If...
We have no deer to eat!
Humans kill the deer
Lions will die
grass
deer
lion

5. All the deer will die too
Inter-dependence of living things
If...
No grass to eat now.
No more lions will eat us, we are free now !
Too many deer here, they even eat our root !
Humans kill the lions
No more grass will grow
All the deer will die too
grass
deer
lion
Number of deer increases