Answer:
less than 1%
Step-by-step explanation:
The approximate percentage of the geologic time that humans have existed on the Earth since its origin is less than 1%. 
The earth is about 4.6 billion years and much of its history has been without the present of human activities. 
- Hominis were the first human to appear on the surface of the earth. 
 - This was in the Miocene epoch which was about 6 million years ago. 
 - Compared to the age of the earth, this time lapse is very small and not up to 1%. 
 - Life first appeared on earth about 3.5billion years. 
 - Since then evolution has taken its due course to give what we have today.