Complexity (such as we see in a pile of autumn leaves) can arise spontaneously from unguided natural processes, but complex specified information cannot.
In a physical world there will be design constraints, so it is only realistic to expect tradeoffs.
In 1991, Richard Dawkins gave a lecture arguing that natural selection can produce complex and seemingly improbable features by an accumulation of small, incremental steps.
A simple tissue we take for granted turns out to represent another example of irreducible complexity in the human body.
Let’s examine the subject in a little more depth than what a commercial can do in a minute and thirty seconds: