Respuesta :
Answer:
Humans
Explanation: Human existence is new compared to all the other options spanning only a few years. We have not existed longer than any of the other species listed yet which may change in the far future.
The existence of which group of organisms spans the shortest geologic time is option b. humans.
What is the geologic time?
It is the time that should be occupied via the geologic earth history. It started from 4.0 billion to 2.5 billion years ago.
Here the human should be existence as compared to the other options.
hence, The existence of which group of organisms spans the shortest geologic time is option b. humans.
Learn more about an organism here: https://brainly.com/question/23027878