1-3-1-7-3 Complexity

0 - 1 Background 1-3 Biological 1-3-1 Evolution 101 1-3-1-7 Big Issues

Big Issues 1-3-1-7

1-3-1-7-3 Looking at complexity

Life is full of grand complications, such as aerodynamic wings, multi-part organs like eyes, and intricate chemical pathways. When faced with such complexity, both opponents and proponents of evolution, Darwin included, have asked the question: how could it evolve?
some complex adaptations
Complex adaptions: bird wings, insect wings, vertebrate eyes, and insect eyes.
Science does not sweep such difficult questions under the rug, but takes them up as interesting areas for research. The difficulty is as follows.

Since many of these complex traits seem to be adaptive, they are likely to have evolved in small steps through natural selection. That is, intermediate forms of the adaptation must have evolved before evolution arrived at a fully-fledged wing, chemical pathway, or eye. But what good is half a wing or only a few of the elements of an eyeball? The intermediate forms of these adaptations may not seem adaptive so how could they be produced by natural selection?

There are several ways such complex novelties may evolve:

Fossils of flightless dinosaurs including feathers