Answer:
1. A source of energy, such as the sun.
2. An atmosphere capable of supporting life forms, with oxygen, nitrogen, and carbon dioxide.
3. Water in a liquid state.
4. Nutrients in the soil, such as nitrogen and phosphorus.
5. A stable temperature range that is not too hot or cold.
6. An ozone layer to protect the planet from harmful radiation.
7. A variety of plant and animal species, with some that can be used as food sources.
8. A magnetic field to protect the planet from solar radiation and other hazards.
Step-by-step explanation: