1. About of all species on Earth
have become extinct.
10%
50%
99%

Believe it or not, 99.9% of the species on Earth have gone extinct. Now, not all of these were caused by Humans, some were caused by MAJOR cataclysmic events such as the extinction of dinosaurs or other prehistoric animals that make up a large amount of the species on Earth. And remember that all the prehistoric plants are also included, because every plant organism is ALSO a species.

Hope this helps, if not, comment below please!!!

i believe the answer is c