Question

about how much of all life that has ever existed previously on earth has become extinct? 1% 50% 75% 99%

Explanation:

Based on scientific research in the field of biology, it is widely accepted that a vast majority of species that have ever existed on Earth have gone extinct. This is due to various factors such as mass extinctions events (e.g., asteroid impacts, volcanic eruptions), environmental changes over geological time scales, and evolutionary processes.

Answer:

99%