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 analyzing fossils, they can group organisms according to the geological time periods (such as Paleozoic, Mesozoic, Cenozoic) in which those organisms existed. Climate has changed significantly over Earth's history (so the first option is wrong). Dinosaurs became extinct about 66 million years ago, and the first humans (hominins) evolved much later (so the third option is wrong). Earth formed about 4.54 billion years ago, and life did not exist immediately; it took some time for life - forms to emerge (so the fourth option is wrong).

Answer:

They grouped organisms by the period in which they existed.