13. fossils are: a remains, impressions, or traces of living creatures that are preserved by geological processes b stones and other materials that have been modified by past human activity c theoretical reconstructions of ancient species, such as dinosaurs and neandertals d geological formations that imitate the shapes of living creatures

The correct answer is A. Remains, impressions or traces of living creatures that are preserved by geological processes.

Explanation

Fossils are organic remains that have left animals and plants millions of years ago and still endure to this day. A fossil can guide us through time to make sense of Earth's history. These remains of organisms from past eras tend to remain attached to sedimentary rocks and show us how the inhabitants of the Earth were millions of years ago. So, the correct answer is A. Remains, impressions or traces of living creatures that are preserved by geological processes.

the answer would be b).