1. Supply of various resources (i.e. food, shelter, water)
2. Predators and parasites
3. Diseases
4. Pollution
5. Habitat loss
6. Natural phenomena (i.e. hurricanes, landslides, earthquakes, droughts)
7. Birth Rates:
- Number of offspring produced each time.
- Period of time between birth events.
- Age at which reproduction begins.
- Ratio of females to males in the population.
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