Question

which is a way that paleontologists have contributed to humans understanding of the history of life?
they found evidence that climate has not changed significantly
they grouped organisms by the period in which they existed.
they discovered that the first humans lived with dinosaurs
they learned that life has existed since earth was created.

Explanation:

Paleontologists study fossils. By examining fossils, they can group organisms according to the geological periods in which the organisms existed. Climate has changed significantly over Earth's history (so the first option is wrong). Dinosaurs went extinct about 65 million years ago, and the first humans (hominins) appeared much later (so the third option is wrong). Earth formed about 4.54 billion years ago, and the earliest evidence of life is from about 3.5 - 3.8 billion years ago (so life did not exist since Earth was created, making the fourth option wrong).

Answer:

They grouped organisms by the period in which they existed.