The concept that some differences between species are too complex to have come about without having been designed is known as irreducible complexity.
They point to complex biological structures such as the eye, the existence of mitochondria, etc., saying that such structures could not have possibly have developed due purely to random chance. Symbiotic relationships, such as plants who can only be pollinated by a specific species of insect, which in turn can only reproduce by using the plant, could not have arisen -- a typical chicken-and-egg problem. It is argued that these kinds of biological features are by their very nature too interdependent to come into existence independently, (through a random process) and then become as intricately intertwined.
One specific theory which accepts this concept and attempts to explain how God was involved is the Intelligent Design Theory.
However, the term 'intelligent design' has a broader usage than that given in the Intelligent Design Theory. It can refer simply to the belief that God designed the universe, without any specific claim as to how or when he did so. Many people consider this belief entirely compatible with standard Darwinian evolution, with no divine intervention -- life could be produced by a purely natural process, evolution, designed by God. God might merely have written the laws of physics, or chosen the fundamental constants, and left the universe to run like clockwork afterwards. The belief that the laws of the universe were constructed to allow for the existence of intelligent life is known as the [Anthropic Cosmological Principle]?.
Not all people who believe that God was involved in the design of the Universe also adhere to the specifics of Intelligent Design theory as proposed by Creationists.
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