A bottleneck of two, or a first pair at our origin older than 500,000 years, is possible.
To help further explain this concept, I would like to introduce readers to my pet bunny, Daisy.
Perhaps it is awe-inspiring to evolutionary biologists to try to work a puzzle, trying to find how everything is connected by common ancestry.
The passionate focus on evolutionary relationships in biology papers tends to obscure awe at the wonders in life.
Let’s consider the eye, which is but one of many subsystems (along with the brain, heart, liver, lungs, etc.) in higher animals that coordinate their tasks to keep an organism alive.