Science proves that the universe and living systems were designed and created.
DNA proves the design of living systems. The fine-tuning of the universe proves the design of the universe.
DNA is an extremely highly specified and complex code which provides the instructions for a nano-manufacturing plant to build proteins for living cells. Proteins have a wide range of function in the cell; such as, building components of the cell to harvesting energy.
There are complex molecular machines, like the bacteria flagellum, that are irreducibly complex, meaning if one part is removed or damaged in the system then the system is either degraded or fails to function.
These machines in the cells of living systems are built part by part in a nano-manufacturing plant using the code inside the DNA molecule. There are codes instructing the machine to start assembling parts in specific orders and instructing when to stop the assembly. There are spell checker type enzymes searching and correcting errors in the code, there is copying and transporting of the code. DNA has nested coding. DNA has a files within folders hierarchical structure. A senior software engineer with Microsoft once said DNA follows design strategies similar to those used by their software programmers but one far more advanced than they have been able to devise.
The specific genetic instructions to build a protein in even the simplest one celled organism would fill hundreds of pages of printed text.
Watch the 3 minute and 34 second video below on how DNA works if you are interested (there is an excellent and easy to understand computer generated model showing how DNA works in this short video):
Another longer video is below:
Regarding the fine tuning of the entire universe, there are approximately 20 constants of the universe which are fine-tuned; such that, if these mathematical figures were off by the most smallest fraction of a percent, life as we know it would not exist. The most finely tuned figure is the cosmological constant (energy density of the vacuum of space) which is fine tuned to an order of magnitude of 1:10^120. If that figure was off by that small a value, there would be no life. To give you an idea of the size of that number, there are approximately 10^80 elementary particles in the known universe and there have been 10^16 seconds since the creation of the universe in the Big Bang approximately 13.8 billion years ago. By the way, back to DNA, the probability of building a short functional protein from amino acids is 1 X 10^164. Just amazing!