In our ever-changing world, a naturally occurring genetic difference in an individual can become an advantage or a fatal flaw in the struggle for survival. Those who live to reproduce pass their favorable genes to future generations. Certain characteristics become more or less prevalent over time as the group as a whole evolves.
CHANGE OVER TIME
Through the process of natural selection, ancestral life forms give rise to new species.
Scroll through the span of geologic time from the Earth's origin to the present day.
Natural selection has generated a diverse collection of eyes, from simple to complex, that help animals sense their surroundings.