The information stored in the genes of chromosomes is inherently unstable and can change over time

This kind of genetic can also happen and organisms replicate

The new cells and organisms inherit changes to their genes and thus change over time

Descent with modification means that offspring have different traits than their parents.

The theory of evolution says that:

• If these traits make the offspring better at replication then the traits will become more common
• If these traits make the offspring worse at replication then the traits will become less common