ELI5: Explain Like I'm 5

Molecular evolution

Molecular evolution is a type of evolution that happens when tiny molecules in living things, like animals, plants, and other organisms, change over time. This happens naturally as these microbes are passed down through generations. Molecules like DNA and proteins change in response to changes in the environment and this can cause the creature to look or behave differently. This can help them survive better in the environment and over time may lead to new, different kinds of creatures.