The trap does not work until all the parts were there. The system itself doesn't work until you fit all of them together.

The trap does not work until all the parts were there. The system itself doesn't work until you fit all of them together.

In order to say that some function is understood, every relevant step in the process must be elucidated.

Although Darwin was able to persuade much of the world that a modern eye could be produced gradually from a much simpler structure, he did not even attempt to explain how the simple light sensitive spot that was his starting point actually worked.

In Darwin's time all of biology was a black box: not only the cell, or the eye, or digestion, or immunity, but every biological structure and function because, ultimately, no one could explain how biological processes occurred.

Science is not a game in which arbitrary rules are used to decide what explanations are to be permitted.

Thus it seemed to Haeckel that such simple life could easily be produced from inanimate material.