You can pick anything you like. Lets just look at the human body as we all have one. I am not saying the human body is perfect, that would be subjective.
But the reasons it can exist is. I'll pick just one thing needed by life.
Salt has a very unique property. In contrast to all other crystalline structures, the atomic structure of salt is not molecular, but electrical. This fact is what makes salt so transformable. When we submerge a quartz crystal. It did not change molecularly, though it has a crystalline structure. Although the crystal can give its energy, its frequency pattern into the surrounding water, which is effortlessly absorbed, the quartz crystal remains the same. The crystal is too rooted in matter to be dissolved or disassociated from its polarity. When we submerge a crystal of salt into water, it dissolves, and the sole (so-lay) is created. Sole is neither water nor salt. It is a higher energetic dimension than either the water or the salt alone. When the sole evaporates, the salt is left behind. This transformability of salt ensures that it does not have to be metabolized in our body. Starch is transformed into sugar, protein into amino acids and fat into glycerin and acid. But salt remains salt. It is directly available to the cells in its ionized form as sole. All other foods must be separated into their components in order for the body to make use of them. But salt always remains in its original form. It even accesses our brain directly. Without salt, you could not touch, move or even think.
Even the simplest processes in our body need salt or its inherent elements in ionized form. For example, it is the task of our nervous system to transmit the stimulation that has been recorded via sensory input to our brain, which in return passes this information back to our muscles in order for us to react to the respective stimuli. An electric potential occurs on the membrane wall of the cells when the positively charged potassium ions leave the cell and the positively charged sodium ions cannot enter due to their size. The outside becomes positively charged and the inside negatively charged. When a nerve cell is stimulated, its membrane suddenly becomes polar opposite and consequently is permeable for the sodium ion. In one-thousandth of a second (1/1000th), the electrical potential is transformed and releases, with every nerve impulse, 90 mill volts of energy. The received stimuli are now being converted into thoughts and actions. Without the elements potassium and sodium in the salt this process is not possible. Not even a single thought is possible, let alone an action, without their presence. Jest the simple act of drinking a glass of water requires millions of instruction that come as impulses. In the beginning there is the thought. This thought is nothing but an electromagnetic frequency. The salt is responsible for enabling this frequency to transmit commands to the muscles and organs.
So is it a fluke salt exists as it does? Without it and its properties, nothing else could be used, so no life.
What about phosphorus? That is also vital. No other substitute can be used. NASA tries arsenic. It didn't work. Or water?
And those are just materials.
What about the strength of gravity/UA. What about how photon's work? What about wave forms such as radiation to spread light and heat, surface tension, nuclear reactions in stars?
I went in to detail about salt just to highlight that it must be exactly as it is or life cannot be. No substitute would do.
The real wonder of the universe and the reason it is described as perfect is not because you may or may not have a perfect life. The universe wasn't built for you. The reason it is perfect is because if you change almost anything, it and its capacity to harbour life would not be. The fact that all of the billions of variables all work together and changing just one line of the code would make the program crash, shows just how brilliant the designer was. Not one mistake, not one thing out of place.
The fact you cannot imagine all of the things that could go wrong that prohibit a universe existing is neither here nor there. Play your thought experiments and use the slender possibility that it all happened by accident or that there must be an uncountable number of universes if it allows you your confirmation bias. The universe won't care. It proved you wrong already, by your very existence.