- **Biosphere:** No confirmed biosphere; evidence suggests past microbial life may have existed but current conditions are harsh.

Question

- **Hydrosphere:** Presence of water in the form of ice and possibly salty liquid water brines; ancient riverbeds indicate past water flow.
- **Geosphere:** Rocky surface with the largest volcano in the solar system (Olympus Mons) and deep canyons (Valles Marineris); features suggest a history of geological activity.
- **Atmosphere:** Thin atmosphere composed mainly of carbon dioxide, with trace amounts of nitrogen and argon; insufficient to support human life.

remove all of the Asterisks from this text

Answer 1

• Biosphere: No confirmed biosphere; evidence suggests past microbial life may have existed but current conditions are harsh.
• Hydrosphere: Presence of water in the form of ice and possibly salty liquid water brines; ancient riverbeds indicate past water flow.
• Geosphere: Rocky surface with the largest volcano in the solar system (Olympus Mons) and deep canyons (Valles Marineris); features suggest a history of geological activity.
• Atmosphere: Thin atmosphere composed mainly of carbon dioxide, with trace amounts of nitrogen and argon; insufficient to support human life.