Environmental cues are picked up by complex systems of the cell senors network and interact with the genetics of the genetic system. In other words, this is how we get different shapes, sizes & colors...These imply a CREATOR, for they are-
Pre-engineered
Pre-programmed
Irreducibly complex
Thus saith the LORD,
thy redeemer,
and he that formed thee from the womb,
I am
the LORD that maketh all things;
Isaiah 44:24