Question 2

What are traces or remains of organisms that lived in the past?

adaptations

mutations

traits

fossils

Fossils are traces of organisms that lived in the past

The answer would be fossils, of course.

Adaptations are changes by which an organism or species becomes better suited to its environment.

Mutations are changes in an organism's DNA.

Traits are, in this case, a genetically determined characteristic.

Fossils are the remains or impressions of a prehistoric organism.