- Humans have been on earth for 300000 years
- Insects have been on earth for 400000000 years
- Fish have been on earth for 419000000 years
- Reptiles have been on earth for 370000000 years
- Therefore, humans have been on earth for the shortest amount of time among insects, reptiles, and fish

Hence, humans have been on earth for the shortest amount of time among insects, reptiles, and fish
[Question]Which species have been on the Earth for the shortest amount of time?
[Context]- Humans have been on earth for 300000 years 
- Insects have been on earth for 400000000 years 
- Fish have been on earth for 419000000 years 
- Reptiles have been on earth for 370000000 years