Final answer:
Fish were the first organisms to appear in geologic time, evolving over 500 million years ago.
Explanation:
The first organisms to appear in geologic time were fish. Fish, as chordates, emerged more than 500 million years ago. From fish, vertebrates evolved, leading to the development of mammals and eventually humans.
Learn more about Evolution of Organisms here:
https://brainly.com/question/13492988
