1. To date, scientists have not uncovered definitive evidence of life on Mars. 2. The geological and chemical characteristics of Mars suggest that, in the past, the planet may have harbored an environment conducive to life. 3. Probes sent to Mars have detected organic molecules, which could potentially serve as a foundation for some microbial life forms. 4. Nevertheless, these discoveries do not conclusively prove the existence of life on Mars, and further investigation is required to address this question.详情